# Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 2x + 10y = 58 -14x + 8y = 140

91,718 questions, page 30
1. ## Algebra 2

how do I solve -15x-2y=-31 4x+6)=11 using linear combination method?

asked by raya on September 22, 2008
2. ## algebra

Here is my question. How do you solve th substitution method in this problem? 9x - y = 40 y = 4x

asked by belinda on September 11, 2011
3. ## Maths

Solve the following simultaneous equation by substitution method 5x+y=35 & 3x-2y=14

asked by Anonymous on February 4, 2015
4. ## College Math

How do you solve a quadratic equation using the indian method?

asked by Quita on September 3, 2012
5. ## Math

Use the Gauss-Jordan method to solve the equation: 3x-5y-2z=-9 -4x+3y+z=11 8x-5y+4z=6

asked by Andrew on November 24, 2010
6. ## math

Use breaking apart method to solve 5 times 5, I'm not sure what this means

asked by Logan on September 17, 2012
7. ## math

USING FORMULAR METHOD SOLVE D EQUATION(M-3)²=121

asked by Anonymous on January 26, 2013
8. ## Maths

solve simultaneous equation by substitution method 3x+2y=12, 4x-3y=1

asked by Esteem on December 1, 2018
9. ## Algebra.

Solve using the addition and mulitplication method principles. 4+9x1?

asked by A.W. on March 22, 2009
10. ## math

solve -15x - 2y = -31, 4x + 6y = 11 using Linear Combination Method?

asked by Anonymous on September 22, 2008
11. ## algebra

solve by using the square root method: (5y+4)^2+100=0

asked by H on March 4, 2012
12. ## geometry

Given that P=(2,10) (5,-3) a. Evaluate the inverse P^-1, of P b. use a matrix method to solve x(2,5)+ y(1,-3) =(7,1)

asked by lindsay on May 24, 2012
13. ## math

solve -15x - 2y = -31, 4x + 6y = 11 using Linear Combination Method?

asked by Anonymous on September 22, 2008
14. ## Math Question

Hi, I need help with a math question. Thank you to whoever helps me! :) When solving a system of 2 equations and 2 unknowns using the substitution method, what is the ideal value of the coefficient of the isolated variable?

asked by Sara on January 7, 2014
15. ## algebra

Solve the system by graphing. (Enter your answers as a comma-separated list. If the system is inconsistent, enter INCONSISTENT. If the system is dependent, enter DEPENDENT.) x + y = 4 x − y = 2 (x, y) =

asked by Ray on September 6, 2018
16. ## Chemistry -- to Dr.Bob

I had posted a while back and still couldn't solve this is there anyway you could show me the steps on how u did this? thank you very much A solution is made by mixing 20.0 mL of toluene C6H5CH3d=0.867gmL with 150.0 mL of benzene C6H6d=0.874gmL. Assuming

asked by Dora on April 5, 2008
17. ## Math

a citizens group wants to determine people's opinions about a new road. The members of the group conduct a survey at the largest part of the mall in the city. Which best describes the sampling method used by the citizens' group? A.) convenience sample B.)

asked by Cassie on March 17, 2014
18. ## Math

Enter your answer and show all the steps that you use to solve this problem in the space provided. Solve the equation. c 4 − 5 = 4

asked by Kyla on May 20, 2019
19. ## English

Bobpursely, thank you for helping me! Our project involving three schools is about biodiversity in water. In particular, participating students will have to carry out a chemical and microbiological analyses of water in each school's local area : river

asked by Henry2 on February 2, 2012
20. ## Science

Bobpursely, thank you for helping me! Our project involving three schools is about biodiversity in water. In particular, participating students will have to carry out a chemical and microbiological analyses of water in each school's local area : river

asked by Henry2 on February 2, 2012
21. ## algebra

Solve the exponential equation. Express the solution in terms of natural logarithms. Then, use a calculator to obtain a decimal approximation for the solution. e^x = 20.9 What is the solution in terms of natural logarithms? The solution set is { }.

asked by edward on February 3, 2016
22. ## physics

How much work in joules is done by a person who uses a force of 25 N to move a desk 3 m? Show work and formula.

asked by tyler on March 24, 2009
23. ## math

use the bus shelter method to work out 1/8 as a decimal

asked by hayley on September 22, 2011
24. ## chemistry

A saturated solution was formed when 4.48×10−2 L of argon, at a pressure of 1.0 atm and temperature of 25 C, was dissolved in 1.0 L of water. Calculate the Henry's law constant for argon in mol/atm. I got an answer of 1.4*10^-3, maybe my units are

asked by RE on September 17, 2009
25. ## maths help needed!(urgent)

find the equation of the tangent to y=x-(a^3/x^2) at the point (a,0) how to i work this out??can someone please show me how to do it step by step?thanks!!! Take the dervative of y y= x- a^3 x^-2 y'=1+2a^3/x^3 so the equation for the tangent is y= mx + b

asked by Emma on May 30, 2007
26. ## math

how many solutions does the system of equations have? 2x= -10+6 and x+5y=3 one two infinitely many none how many solutions does the system of equations have? y=5x+7and3y-15x=18 one two infinitely many none how many solutions does the system of equations

asked by rainbow on December 16, 2018
27. ## chemistry step by step thank a lot

342gm of 20% by mass of ba (OH)2 solution sq gr 0.57 is reacted with 1200ml of 2M hn03. If the final density is same as pure water then molarity of the ion in resulting solution by nature of the above solution is dentified 0.888m Who solve it for me step

asked by ken on July 6, 2014
28. ## Math

Sustem of equations. I have to solve the system of equations by graphing and solving. Ther are thirty-three students in the Chess Club. There are five more boys than girls in the club. Write and solve a system of equations to find the number of boys and

asked by Alexis on January 29, 2013
29. ## Math

Solve the system of equations 3x-y=11 -5x+y=12 2. Perform the indicated operation and simplify (5/(x-2)+(4(x^2-2x) 3.simpify and write with only positive exponents (7x^3y^-2)/(x^-4y^9)^-3 4. find the solution of the inequality 2x-11 is less than or equal

asked by kelly on August 22, 2013
30. ## Chemistry

I'm having trouble with converting units. My teacher wants us to show work but I can't figure out how to do it. An example is, 35 mL = ____ dL. By showing work, how do you do that?

asked by Kayla on September 14, 2007
31. ## Physics

What visible wavelengths will eject electrons from a a metal with a work function of 2.6 eV? Please show all work I am a little confused :)

asked by DCM on April 6, 2012
32. ## Physics

Show that 90 J of work is needed to increase the speed of a 20-kg cart by 3 m/s. Power = work done time interval= W t

asked by Miss Angie on September 22, 2013
33. ## DrBob222 my previous question

You asked me to show my work for one of my questions a few minutes ago and i need you to verify my work because you said my answer was wrong

asked by Sandy on January 12, 2015
34. ## Physic II

How much work is done by 3 moles of gas when they triple their volume at a constant temperature of 400 K ? show work please

asked by julide on April 17, 2014
35. ## Culinary

What are 2 recipes for the radiation method? What are 2 recipes for the convection method? What are 2 recipes for the conduction method? What are 2 recipes for the microwave? What are 2 recipes for the radiation method? grilled chicken toast What are 2

asked by Anonymous on October 16, 2006
36. ## Chemistry

1.How many grams of KCl is in 225 mL of a 0.452 M solution? 2.What volume in mL of 0.555 M solution contains 85.0g Na2SO4? 3.How many grams of CaCl2 would be dissolved in 2.0L of a 0.10 M solution of CaCl2? Can you please show me how to do these problems?

asked by Jamie on April 14, 2015
37. ## physics

Two astronauts, each having a mass of 78.5 kg, are connected by a 10.0-m rope of negligible mass. They are isolated in space, moving in circles around the point halfway between them at a speed of 5.50 m/s. Treating the astronauts as particles, calculate

asked by heather on December 1, 2012
38. ## MATH PLEASE HELP

1) -5g-6 for g = -2 2) Write an algebraic expression for the sum of 3 Coins and c Coins 3) What Value of x is a solution to the equation? x-2 = 16 4) use mental math to solve the equation. z/-12 = -5 5) estimate the solution of the equation x-8.1 = 5.3 to

asked by Jack on October 25, 2017
39. ## Math

1) -5g-6 for g = -2 2) Write an algebraic expression for the sum of 3 Coins and c Coins 3) What Value of x is a solution to the equation? x-2 = 16 4) use mental math to solve the equation. z/-12 = -5 5) estimate the solution of the equation x-8.1 = 5.3 to

asked by Jack on October 25, 2017
40. ## math

1) -5g-6 for g = -2 2) Write an algebraic expression for the sum of 3 Coins and c Coins 3) What Value of x is a solution to the equation? x-2 = 16 4) use mental math to solve the equation. z/-12 = -5 5) estimate the solution of the equation x-8.1 = 5.3 to

asked by gurl please help mee!!! on November 1, 2018
41. ## Pre Calculus

The population P of a culture of bacteria is described by the equation P = 1600e^0.052t where t is time, in hours, relative to the time at which the population was 1600. (a) What was the population at t = 6 hours? Show your work. (b) After how many hours

asked by Jessica Maths on July 6, 2016
42. ## algebra

1. In solving the equation (x + 3)(x + 1) = 48, Eric stated that the solution would be x + 3 = 48 => x = 45 or (x + 1) = 48 => x = 47 However, at least one of these solutions fails to work when substituted back into the original equation. Why is that?

asked by Taina on June 20, 2011
43. ## math

In solving the equation (x + 4)(x – 7) = -18, Eric stated that the solution would be x + 4 = -18 => x = -22 or (x – 7) = -18 => x = -11 However, at least one of these solutions fails to work when substituted back into the original equation. Why is

asked by carol on May 4, 2011
44. ## math

I need help solve the equation by fractions 8/(21-y) = 12/(y+19) I think the answer is y = 5, i just need to know how to do work out. i done some solution like this first multiply by(21-y)(y+19)(assuming that y = 21 and y = 19: (21-y)(y+19)8/(21-y) =

asked by Anonymous on February 23, 2012
45. ## algbera

In solving the equation (x + 3)(x + 1) = 48, Eric stated that the solution would be x + 3 = 48 => x = 45 or (x + 1) = 48 => x = 47 However, at least one of these solutions fails to work when substituted back into the original equation. Why is that? Please

asked by kozy on May 1, 2011
46. ## Algebra

In solving the equation (x + 3)(x + 1) = 48, Eric stated that the solution would be x + 3 = 48 => x = 45 or (x + 1) = 48 => x = 47 However, at least one of these solutions fails to work when substituted back into the original equation. Why is that? Please

asked by Sierra on October 13, 2011
47. ## criminal justice

Write an 850- to 1,000-word paper identifying three areas of the criminal court system you believe need to be changed or improved and recommending corrective actions for each. „h Identify three aspects or areas of the criminal court system you believe

asked by Anonymous on June 20, 2010
48. ## Math

A ball is placed on a long inclined ramp. It rolls down the ramp as shown in the diagram. The equation d = 23 · t2 represents the distance in feet, d, the ball travels in t seconds. Part A How far does the ball travel in 5 seconds? Show your work. Part B

asked by Anonymous on March 19, 2015
49. ## trigonometry

Solve the following right triangles: a. a=117 ft, b=16.35 ft b. B=8 degrees 29',and a=32.8 ft for a. got 118.14 by Applying the Pythagorean Theorem a^2 + b^2 = c^2. can you show me the steps of how to solve b.

asked by Jad on January 15, 2011
50. ## math

how would I solve 10=7-m? I don't understand how to find the variable and I use flowchart!none of my math books show me how! so how can I solve problems like these?

asked by Emi on January 11, 2013
51. ## Algebra

Solve by using your knowledge of the Distributive Property and combining like terms. 1. 5x-(9x-10)=34 -4x-10=34 -4x=44 X=-11 Did I solve this correctly? If not can someone please show me how to get the correct answer?

asked by Stephon on October 5, 2017
52. ## Physics

The engine weighs 4500 newtons and it is lifted 1.5 meters up by the block and tackle system. To accomplish this, the mechanic must apply a force of 225 newtons while pulling a total of 37.5 meters of chain through the block and tackle pulley system. What

asked by John on March 23, 2011
53. ## physics

The engine weighs 4500 newtons and it is lifted 1.5 meters up by the block and tackle system. To accomplish this, the mechanic must apply a force of 225 newtons while pulling a total of 37.5 meters of chain through the block and tackle pulley system. What

asked by John on March 24, 2011
54. ## math

Simplify and show: 2a-6(10a)-5a^2(2) ----------------- (2a-6)^2 This is my work but its not right. 10a-10a^2 -------- 2a-6 Then solve for a by setting numerator to zero. so I got this... 10a-10a^2=0 10a(1-a)=0 a=0, a=1 My book says a=0, or a=6 why didn't I

asked by Becks on April 29, 2009
55. ## Math

If 360 workers called in sick and 240 went to work, how many workers work at the company all together? Solve using fractions and multiplication or division. Obviously the answer is 600 but how do I solve the problem using multiplication or division?

asked by Anonymous on December 31, 2014
56. ## chemistry

what is the method to prepartion CO from these equation in the lab CaCo3 + 2HCl → CaCl2+H2O+ CO2 (g) Or CaCo3 ----(Heat 500 to 600 C0→ Cao +Co2 (g) 2- CO2 + H2 → CO (s) + H2O(g) i have CaCo3 powder and i do not have any idea how to work in lab???

asked by roro on March 12, 2017
57. ## chemistry

Inglês Português Espanhol For the determination of the quantity of chloride in a physiological serum sample by the Volhard method, a sample of 25.00 ml was treated with 50.00 ml of 0.110 mol/L Silver nitrate solution and the excess of silver ions was

asked by william on October 3, 2017
58. ## Math-Algebra 1

Part 1: When writing linear equations, how do you determine which form of a line to use? Part 2: Choose 1 set of points from the choices below. Then, solve the problem and post your solution, showing your steps. Write an equation in point-slope form for

asked by Gabby on November 23, 2013
59. ## Math 116

Identify the solution (s) of the system of equations, if any. x=1 y=1 (A) no solutions (B) (0,0) (c) (1,1) (D) infinitely many solutions Identify the solution (s) of the system of equations, if any. 3x-2y=6 5x=5-25y (A) (28/13, 3/13) (B) (-3/17, 32/17) (C)

asked by Queta on June 29, 2013
60. ## Chemistry

A system initially has an internal energy U of 493 J. It undergoes a process during which it releases 107 J of heat energy to the surroundings, and does work of 225 J. What is the final energy of the system, in J?

asked by Chris on May 5, 2014
61. ## physics

The engine weighs 4500 newtons and it is lifted 1.5 meters up by the block and tackle system. The mechanic must apply a force of 225 newtons while pulling a total of 37.5 meters of chain through the block and tackle pulley system. What is the work done by

asked by jay on March 17, 2011
62. ## statistics 3

Exercise #4 Quality control problem: According to U.S. News & World Report, a laboratory in Atlanta is processing snake venom for use in medical research. Five processing methods are being tested to determine which is least likely to contaminate the

asked by sam on July 26, 2010
63. ## Math

look at this other chart- 36 of 200 cat owners prefer human food only, 116 out 0f 200 perfer pet food only,48 out of 200 pet owners perfer human and pet food so what percent of cat owners repoter that their cats liked either human food or pet food only.

asked by Julie on May 31, 2007
64. ## Math

-x^3 + 1.85x^2 - x +0.15 = 0 how can you solve for x? An exact solution or a numerical solution? Exact solutions can be obtained as follows: x^3 - 1.85x^2 + x - 0.15 = 0 First get rid of the quadratic term by substituting: x = (y + 1.85/3) You then obtain

asked by JV on July 10, 2007
65. ## math help pls pls

A system of equations is shown below: x + y = 3 2x – y = 6 The x-coordinate of the solution to this system of equations is _____.

asked by Oscar on December 20, 2015
66. ## Math

Which ordered pair is a solution of the system of equations y=x^2-x-20 and y=3x-15? a. (-5,-30) b. (-1,-18) c. (0,5) d. (5,-1) When I solved the system of equations I got 5 and -1. What do I do next?

asked by Angie on May 17, 2009
67. ## Algebra

I have a problem, which requires I solve the following system of linear inequality graphically. my textbook is vague and does not provide online examples or instruction to assist me withinfo to work the problem. Please help? Thank you. 3x - y is lessor

asked by Carl on January 24, 2008
68. ## Mathematics

Simplify the expression. (6x^-2)^2(0.5x)^4. Show your work. I know that the answer is 9x^2-+4 I just need help showing the work. PLEASE HELP!

asked by Cali on January 22, 2017
69. ## Math

The value of 12 is obtained by multiplying p% by A.12 B.12/p C.p/12 D.1200/p E.100p/12 Is there any work for this?, if so please show work.

asked by Johnny on April 19, 2014
70. ## Calculus - Find volume of cylinder

There is a cylindrical tank lying horizontally on the ground, its diameter is 8 feet, and length is 25 feet, the depth of the water currently in the tank is 2 feet. (1 gallon=231 cubic inches) How many gallons of water are in the tank? How many gallons of

asked by Ashely on May 15, 2007
71. ## Math

There are 1170 students in a school. The ration of girls to boys is 23 : 22. The system below describes..? relationships between the number of girls and the number of boys. g+b=1170 g/b=22/23 a. Solve the proportion for g. b. Solve the system. c. How many

asked by Angie on March 31, 2009
72. ## Math

Find the prime factorization of 198, and write it in exponent form. Show your method.

asked by Anonymous on October 4, 2009
73. ## Math

A chemistry teacher needs 2.5 liters of a sulfuric acid solution that is 20% sulfuric acid and 80% water . He has 2 liters of a 15% sulfuric acid solutionleft over from earlier laboratory exercises. He also has 44 liters of a 50% solution. Let x represent

asked by Paul on May 31, 2011
74. ## algebra

use substitution to solve the linear system 3x+2y=-5 4x-3y=16 help plz!!! Solve for y in one formula, and then substitute that value for y in the other formula to solve for x. Once you find x, substitute that value into either formula to get the value for

asked by kerry on March 7, 2007
75. ## Science Mixture

Could you use the filtration method to separate a sugar water solution? Why or why not?

asked by Harmony Ann on February 12, 2014
76. ## math

the general solution of the diff. eq. is y' = (1/x)(y/(1-y)) - (1-x)(y/(1-y)) what is the implicit form? what method would I use for this?

asked by Anonymous on August 1, 2015
77. ## Science

A solution is prepared by dissolving 38 g of H2S04 in 220 g water. If the density of the solution is 1.96 g/ml, find its: molality molarity mole fraction of the components of the solution normality This assignment is needed tomorrow. I really don't know

asked by Drenju on January 26, 2014
78. ## Physics (very long question)

Two astronauts (Fig. P8.68), each having a mass of 84.0 kg, are connected by a 10.0 m rope of negligible mass. They are isolated in space, moving in circles around the point halfway betwen them at a speed of 5.80 m/s. Treating the astronauts as particles,

asked by Anonymous on November 18, 2010
79. ## Chemistry

What is the molarity of a phosphoric acid solution if 32.3 mL of the phosphoric acid solution is titrated to the final equivalence point with 20.6 mL of 0.581 M sodium hydroxide acid solution? H3PO4 + 3NaOH ==> Na3PO4 + 3H2O mols NaOH = 0.0206L*0.581 M= ??

asked by Question on February 11, 2007
80. ## research&writing

Due Week 2 and worth 100 points Your sister owns a small clothing store. During a conversation at a family dinner, she mentions her frustration with having to manually track and reorder high demand items. She would like an automated system but has a very

asked by precious on January 9, 2012
81. ## Science -- I can't find my original post...

In a closed room with an electric system controlled by a thermostat, would hanging a load of laundry to dry in that room require the system to work harder to maintain the temperature of the room?

asked by Kelly on January 9, 2014
82. ## Chemistry

If 325mL of a 0.58 M solution of a propanoic acid (a fatty acid) was mixed with excess glycerol what is, the maximum number of molecules of fat or oil that could result?(you will need Avogadros number = 6.022 X 10 to the 23rd power)....I need to show all

asked by Jennifer on December 3, 2014
83. ## math

Gillian did not attend to school from 17th january 2012 to 4th february 2012.How many days did Gillian miss the school?please anyone to solve it and show clear solution

asked by kelvin on August 23, 2016
84. ## algebra

can someone show me how to solve this the instructions are for me to solve by the quadriatic formula is this really 8 grade math im confused im trying to help my daughter tammi and i have never run across this before X^2 + 9=0

asked by tammi on October 7, 2013
85. ## Math

In solving the eqaution(x+4)(x-4),Eric stated thatthe solution would be x+4=33=>x=29 or (x-4)=33=>x=37 However, at least one of these solutions fails to work when substituted back into the original eqaution. Why is that?Help Eric to understand better,solve

asked by Sonya on February 16, 2011
86. ## intermediate algebra

In solving the equation (x-1)(x+2)=30. Eric stated that the solution would be x-1=30¨T¡úx=31 or(x-2)¨T30¨T¡úx=32 However, at least on of these solutions fails to work when subsitituted back into the orignal equation. Why is that? Please help Eric to

asked by ROCKY on July 28, 2011
87. ## calculus

I really don't know where to start or go with this question...There aren't any similar examples in my book so if you could walk me through it so I can be prepared for my test - that would be great! Thanks. (a) Approximate √26 by using the linearization

asked by Tenley on December 31, 2014
88. ## MAT126: Survey of Mathematical Methods

All numbers in our real number system are the product of prime numbers. Complete the following steps for this discussion: List the ages of two people in your life, one older than you and one younger than you. It would be best if the younger person was 15

asked by sheila on December 20, 2013
89. ## Finance

need 1-2 pages Nancy Tai has recently opened a revolving charge account with MasterCard. Her credit limit is \$1000, but she has not charged that much since opening the account. Nancy hasn't had the time to review her monthly statements as promptly as she

asked by Jessi on June 18, 2007
90. ## geometry

Find the perimeter and area of a right triangle if one leg measures 9 cm and the other leg measures 40 cm. Show all work step by step Include correct units with solution.

asked by kay on May 16, 2011
91. ## Chemistry

How many moles of steric acid are contained in 0.25mL of a hexane solution containing 5.4x10^-4 grams of steric acid/L? (Hint: g/L x L = g/ (g/mol)=mol). Please show your work. Please help. Thank you

asked by Paul on October 6, 2014
92. ## Chemistry

How many moles of steric acid are contained in 0.25mL of a hexane solution containing 5.4x10^-4 grams of steric acid/L? (Hint: g/L x L = g/ (g/mol)=mol). Please show your work. Please help. Thank you

asked by Paul on October 6, 2014
93. ## Eng. Proofread Please

Can you profread this for me please? Overall the essay is very well developed and has some good concepts. After reading the entire essay I found the statement of conflict paragraph to be the weakest. The topic sentence that use really grabs the readers

asked by Monica on February 24, 2009
94. ## Statistics

If bird flu mortality in one sample of 100 is 20% and in another sample of 100 it is 30%. Is the difference in mortality rate is significant? Solve for the statistic value of Z at probability alpha level of 0.05. Please show your solution.

asked by Jolina Marie Pedron on March 6, 2015
95. ## college math

system of equations: solve the following system of operations using matrices (row operations) {5x + y + z + w = -5} {x - 2y + 2z -3w = -4}

asked by Cece on September 14, 2013
96. ## Computer Programming

I already posted this question but I gave it a try I'm not sure if I'm on the right track: Make a util class with three methods. First method's name is add, that returns the result by adding two numbers. Second method's name is multiply, that returns the

asked by Jake on July 8, 2015
97. ## Trig

h t t p : / / m a t h c e n t r a l . u r e g i n a . c a / Q Q / d a t a b a s e / Q Q . 0 9 . 9 9 / a n g e l a 2 . 2 . g i f give that picture how do I solve for (h) I know that you you From the diagram tan(3.5) = h/(13 + x) and tan(9) = h/x. Solve the

asked by Trig on August 27, 2009
98. ## Physics

Damon, this is my last question for today for you. Thanks for all your help. A gas is at an initial pressure of 1.24104 Pa and occupies a volume of 0.28 m3. The (slow) addition of 23,570 cal of heat to the system causes it to expand in an isobaric manner

asked by Riley on February 3, 2014
99. ## Algebra 116 Help Please

Buying a Home For most people, buying a house is a great investment that can offer security in an uncertain world, but buying a house is also a commitment. Application Practice After putting your name on this document, above, answer the following

asked by Sydney on September 8, 2010
100. ## math

Of the 50 state in the united state, 8 states have a population of one million people or fewer.Make a plan and write an addition equation to show that the sum of the state with more than one million people and the states whith one million people or fewer

asked by Anonymous on November 16, 2011