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

92,096 questions, page 43
1. precalculus HELP!

I posted this question before: What is the area enclosed by the graph of the absolute value(3x)+ the absolute value(4y)=12 I tried solving for y and got: y=4-x when I graphed this, I got a linear equation graph...I am wondering if I am supposed to find the

asked by sara on December 4, 2006
2. Science (Chemistry)

How many grams of dry NH4Cl need to be added to 1.90 L of a 0.200 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.99? Kb for ammonia is1.8*10^-5. Can anyone help me with this question? I have no idea how to solve it.

asked by Taylor on March 12, 2012
3. chemistry

1.92g sample of hydrogen peroxide solution generates 37.8mL O2 at 759 torr and 35 C. What is the percent strength of the peroxide solution? how would you solve this problem and which equations would you use?

asked by anna on February 7, 2008
4. chemistry

Determine the hydroxide ion concentration in a solution that is 0.0004 M HCl. Answer in units of M. I have no idea how to start, I just need to know what I need to solve for and hoe to set it up, I know the formula pOH^-=-log[OH^-] I just don't know where

asked by will on April 16, 2015
5. Calc

You are a lab technician and must create 250 ml of a 17% salt-solution. a. If you have 500 ml of 28% salt-solution, how many milliliters of it should you mix with water in order to create 250 ml of a 17% salt-solution? b. If you have 400 ml of 40%

asked by Fatih on February 16, 2012
6. math

You are a lab technician and must create 250 ml of a 17% salt-solution. a. If you have 500 ml of 28% salt-solution, how many milliliters of it should you mix with water in order to create 250 ml of a 17% salt-solution? b. If you have 400 ml of 40%

asked by Fatih on February 15, 2012
7. Math

What are the solution of the system? y=x^2+3x-4 y=3x+2 A (-3,6) and (2,-4) B(-3,-4) and (2,6) C (-3,-4) and (-2,-2) D no solution I think it is D

asked by Pal on May 22, 2018
8. calculus

Form a polynomial f(x) with real coeffiecients having the given degree and zeros. degree 4, zeros 3, multiplicity 2; 6i f(x)=a() Can someone show how to do this. I have tried and do not have a clue. I am lost!!! So, please show work.

asked by Breanna on December 30, 2012
9. Algebra

A basketball player makes 53 points on 24 shots. How many 3 pointers and 2 pointers did he shoot. Show your work. I know that the answer is 5 for the 3 pointers and 19 2 pointers but I don't know how to show it.

asked by Alex on April 7, 2016
10. CHEMISTRY LAB

determine Fe3+ in a solution that may be in the 0.0001 to 0.0005 M range.outline a spectrophotometric method that would accurately give the required data. be specific about the solutions that you would use.

asked by Equilibrium on July 6, 2011
11. physics

prepare a standard solution of oxalic acid with a concentration of 0.05mol.dm3. a report of the investigation. give the aim, apparatus, method and results.

asked by anonymous on February 24, 2011
12. Math

Use the data given below to answer the following questions: 68,63,67,66,65,87,69,61,86,82,28 What is the outlier of the data? Explain why you consider this number the outlier. Calculate the mean of the given data set. You must show your work! Calculate the

asked by BlackWeb on September 18, 2018
13. ALGEBRA

CLASIFY THE SYSTEM { X-Y+Z=6 { 7X-2Y-2Z=1 { 5X+6Y+3Z=11 A)CONSISTENT. ONE SOLUTION B)INCONSISTENT. INFINITELY MANY SOLUTIONS C)INCONSISTENT. NO SOLUTION D)CONSISTENT. INFINITELY MANY SOLUTION

asked by janika on May 15, 2012
14. math,algebra II

I have to work with these types of problems dealing with matrises can someone show me how to solve them.Heres one of them: Directions: Find the values of the variables in each equation in the first matrix it looks like this a+2 3z+1 5m 4k 0 3 then theres a

asked by jas on June 6, 2007
15. MATH/ALGEBRA

SOLVE: ã(4x+ 5) + 1 = 0 ã(4x+ 5)= -1 (ã(4x+ 5))squared= (-1)squared 4x + 5 = 1 I know I solve for x I get that x = 1 but my book states that x = -1 Please show me how this is true I don't understand what the term ã means. Can you retype the

asked by Dee on July 24, 2007
16. Chemistry

Posted by Cyndy on Sunday, February 15, 2015 at 6:45pm. How many grams of ammonium chloride are needed to raise the ammonia level 5 ppm in a 300 gallon system? Now, I have worked the problem so many times I have confused myself I think. I keep getting 2

asked by Cyndy-Urgent on February 16, 2015
17. healthcare

I need some help with my final project. I have to develop a unique proposal that describes a new health care system. Consider the current U.S. health care system's strengths, weakness, and challenges. Also, o What is your vision for the new health care

asked by Nikia Walker on November 3, 2008
18. Algebra

I have 3 questions I'm stuck on and would love for someone to explain and show me how to solve them so I can also solve the other one. Find the partial sum S6 1. An=3n+2 2. Find the number of terms n in an arithmetic sequence if a1=20, d=5, and An=75. 3.

asked by Jess on April 3, 2013
19. Math

Al can paint a room in a hours working alone. Bill can paint a room in b hours working alone. Working alone, Bill takes tow more hours to paint a room than Al. Working together, they can paint a room in 8 hours. Write down a system of two equations

asked by James on August 12, 2007
20. life science

which two statements explains how a earthworms organ system help provide its cells with oxygen? a. the nervous system removes oxygen from the body **b. the curatorial system carries oxygen to different parts of the body. **c. the respiratory system brings

asked by thequestionator on February 14, 2019

Determine the quarter points. y=cos(x−5π/2) ​(Type an exact​ answer, using π as needed. Use integers or fractions for any numbers in the​ expression.) - Please show step by step work. Show how you're getting the numbers/answers because I want to

asked by chichi on August 3, 2016
22. Chemistry

When given a chemical reaction, how would I know whether a reaction is endo or exothermic and whether work is done on the system or by the system. Without using any calculations. So I have a couple reactions which I have to use chemical reasoning to to

asked by Raj on November 20, 2007
23. algebra/trig

A person is standing 50meters away from a target whos center is 90cm off the ground. The height to the person's eyes is 66inches. Find the correct height for the target if the person is standing 4.5 meters from the target. I have tried a couples times to

asked by Riley on April 3, 2009
24. georgraphy

In the following passage written by a conquistador in 1540, what can you infer about how sick citizens were treated? “No one who was lazy or tried to live by the work of others was tolerated; everyone had to work. Thus on certain days each lord went to

asked by Jay on October 24, 2016
25. Chemistry- Dr.Bob222

Using the Nernst equation, determine the diluted concentration for both cells. Show your work. Given that [Cu2+] and [Zn2+] are both 2M. Note: I know that the nernst equation is E= E*cell=(-0.0592 V/n)log Q where Q in this case are [Sn2+]/[Cu2+] and

asked by Anonymous on May 28, 2016
26. Chemistry- Dr.Bob222

Using the Nernst equation, determine the diluted concentration for both cells. Show your work. Given that [Cu2+] and [Zn2+] are both 2M. Note: I know that the nernst equation is E= E*cell=(-0.0592 V/n)log Q where Q in this case are [Sn2+]/[Cu2+] and

asked by Anonymous on May 28, 2016
27. MATH HELP NEEDED

. –2v – 7 = –23 (1 point) 15******** 8 –8 –15 2. start fraction x over 3 end fraction – 10 = –12 (1 point) –6 –66 6****** 66 3. start fraction x over 5 end fraction + 6 = 10 (1 point) 44 30 20******** –20 4. 3(4 – 2x) = –2x (1

asked by Bill Cipher on November 26, 2016
28. science

Why do scientists use models? a. Scientists use models to learn about things that are too small, too large, or too complex to observe directly. b. Scientists use models because doing so is always part of the scientific method. c. Scientists use models

asked by Anonymous on September 19, 2013
29. Trig

solve to four decimals places 5.0118 sinx - 3.1105=0 :for all real x values I will be happy to critique your work. Solve for sinx, then arcsinx

asked by Kate on April 16, 2007
30. Physics 11

Can someone explain what work total is? In my lessons it said Work total is the sum of all work & showed an example of different work being added together. An assignment after that however made me think that may not be the case... Do I need to add the work

asked by Kayla on May 29, 2017
31. chemistry

The time dependent concentration of solute particles in a solution is given by c(r, t) = [n/8(pi D t)^(3/2)] e^(-r^2 /4 D t) where r^2 = x^2 + y^2 + z^2 with x, y, and z being the values of three components of the position in the Cartesian coordinate

asked by drifting on December 2, 2009
32. math,correction

okay for the first one i/ve done it twice and both times i got 10, not -10. check your work to make sure you did it correctly. for the second one i got 24 so you are correct Directions solve for x. (x)/(x-2)-(x+1)/(x)=(8)/(x^2-2x) The answer i get is :

asked by Marie on February 25, 2007
33. Algebra

I've been trying to figure out this equation for over an hour but all the answers I get are wrong. The equation is 0.9=-10I^2+6I . The answer is supposed to be 0.3 and it does work out, but I have tried all different ways to solve for I and nothing seems

asked by Amy on January 12, 2008
34. Chemistry

Please write down the redox reactions (using the half-reaction method!) a)Cl2 from OCl- and Cl- in acidic solution b)Br2 from BrO3- and Br- in acidic solution -You don't have to do both, but could you help me step up the half reactions especially for OCl-

asked by Annie on October 28, 2016
35. Chemistry

Use the following answers for questions 1 - 3. (A) F (B) S (C) Mg (D) Ar (E) Mn 3. Forms oxides that are common air pollutants and that yield acidic solution in water I think the answer to this one is B, but why is it B? I see how it would yield an acidic

asked by Rachel on April 12, 2007
36. math

The problem I am trying to solve is from AQA Mechanics M1 and is as follows: An object is moving in a plane. At time t=0, it is at the origin, O, and moving with velocity u. After 2 seconds it is at A where OA = -2i - 4j. After a further 3 seconds it is at

asked by Maggie on April 9, 2013
37. maths - two dimensional motion

The problem I am trying to solve is from AQA Mechanics M1 and is as follows: An object is moving in a plane. At time t=0, it is at the origin, O, and moving with velocity u. After 2 seconds it is at A where OA = -2i - 4j. After a further 3 seconds it is at

asked by Maggie on April 9, 2013
38. chemistry

calculate the mass, in grams, of NaCl present in each of the following solutions. 6.25 g of 11.5% NaCl solution 452 g of 12.3% NaCl solution please show me how to do these. Thanks.

asked by pat on April 29, 2011
39. Algebra

Solve the logarithmic equation. Be sure to reject any value of x that is not in the domain of the original logarithmic expression. ln ã(x+4)=1 What is the exact solution? Select the correct choice below and, if necessary, fill in the answer box to

asked by edward on February 3, 2016
40. Math - Solving Linear systems

Solve the linear system in two space [x,y] = [-12,-7] + s[8,-5] [x,y] = [2,-1] + t[3,-2]

asked by Shaila on August 28, 2010
41. Algebra 1

solve the system by graphing. Then classify 2x-y=12 2x+3y=4. Thank you

asked by Esther on February 3, 2011
42. Math

Solve the system equations y=4x+8,x^2+7x-20 I'm truly lost

asked by Lynette on March 27, 2017
43. algerbra(college)

solve the system of equations by graphing -3x - 2y=24 3x-y=-6

asked by jay on November 19, 2009
44. algebra

solve the system of equations using substitution. y = 4x + 2 y = 3x + 6 a. (4, 18) b. (–4, –14) c. (–14, –4) d. (–4, –6)

asked by tiffany on January 20, 2011
45. Elementary Algebra

How do I solve the system of equations by graphing? example:4x+y+2, x= 1/2+5

asked by Wanda on August 1, 2012
46. algebra 2

SOlve the system of inequalites by graphing. y< -4x-2 - y >3x-3

asked by skyler on August 26, 2013
47. algebra

solve the system of equations using substitution. y = 2x + 5 y = 3x a. (–5, –15) b. (5, 15) c. (–15, –5) d. (1, 3)

asked by tiffany on January 20, 2011
48. algebra

use linear combinations to solve these system. 3x+2y=22 9x-8y=-4

asked by aviel on November 29, 2010
49. math

solve the system of equations in three variables -3x+y-z=-10

asked by Laura on March 7, 2013
50. algebra

solve the system of equations using substitution. y = x + 10 y = 3x a. (5, 15) b. (2.5, 7.5) c. (–15, –5) d. (–5, –15)

asked by tiffany on January 20, 2011
51. math

Solve the system of equationds by graphing. u=v 4u=3v-3

asked by RomanRamirez on September 23, 2008
52. math

SOLVE THE SYSTEM USING SUBSTITUTION MATH X-4Y=49 3Y-4Y=-66

asked by Anonymous on September 14, 2010
53. PLEASE!!!! HELP!!!! ME!!!!

solve the system using substitution {x+2y=11 {3x+2y=13 i just told u this one

asked by andrea on February 22, 2007
54. Math

Solve the following system: 4x-y+z=6 2x+y+2z=3 3x-2y+z=3 Find the values for x, y, and z

asked by Lana on April 28, 2013
55. algebra

Solve the system by substitution: -4.5x-2y=-12.15 3.25x-y=-0.75

asked by Candy on September 18, 2013
56. algebra

Solve the system of equations by graphing. -3x-2y=18 3x-y=0

asked by Christina on August 12, 2012
57. Math

Solve the nonlinear system by substitution {2x+y=5 {x^2+y^2=50

asked by Marly on November 17, 2014
58. Algebra

Solve the system by either elimation or substitution: x+8y=18 y=-2/7x-18/7

asked by Katrina on August 2, 2010
59. Math

Use substitution to solve the linear system. 3x+4y=27 y=x-2

asked by Mike on March 3, 2008
60. Algebra

I can't get this problem, could you please help me? Solve each system of equations x+2y=12 3y-4z=25 x+6y+z=20

asked by Beth on September 25, 2011
61. Pre - CALCULUS

Use Cramer's rule to solve the system. 2x + 4y - z = 32 x - 2y + 2z = -5 5x + y + z = 20 A. {( 1, -9, -6)} B. {( 2, 7, 6)} C. {( 9, 6, 9)} D. {( 1, 9, 6)} d ?

asked by Ciara on April 11, 2015
62. Algebra Check

Solve the system 4x - 7y = 5 14y = 8x + 10 I got y = 10/-13 x = -5/52 but it doesn't seem right

asked by Amy~ on August 31, 2010
63. math

solve the system of linear equations 2x+2y=1 3x-y=6 thanks

asked by sandra on April 7, 2012
64. Algebra 1

solve each following system by substitution 4x-12y=5 -x+3y=-1

asked by Cynthia on September 2, 2007
65. algebra

Solve the system by graphing. x+y=4 -x+y=2 How do I graph this?

asked by BB on January 10, 2008
66. Pre-Calc

Solve this system of linear equations. 5x+2y-7z=-13 9y+z=29 z=2 Is this -1, 3, 2?

asked by Anonymous on March 1, 2016
67. trig

Solve system of inequalities by graphing Yx+4

asked by theo on October 20, 2011
68. Algebra 1

solve each following system by substitution. 4x-12y=5 -x+3y=-1

asked by Cynthia on September 2, 2007
69. math

Use a graph to solve each system of equations. 3.4x = 6.3y = 4.4 2.1x + 3.7y = 3.1

asked by jack on January 10, 2008
70. algebra

Solve the following system of equations: x + 2y - z = 2 -3x + y + z = -9 x + y - 2z = 5 I came up with (-2,-11/3, -2) Is this correct?

asked by mary on April 25, 2011
71. math

Solve the following system of equations. 4x+9y=10 x= 5x+18y=19 y=

asked by pls check on May 28, 2014
72. math

is (-1, 5) a soultion for each system? x + y = 4 x=-1 can someone please explain how to solve this? thanks.

asked by Amber on September 16, 2007
73. Math

Solve the system of two equations 2y=8 and 15y=2x-4

asked by Anon on December 28, 2014
74. pre calculus

use matrices to solve the system of equations , if possible 2x+3y+z=10 2x-3y-3z=22 4x-2y+3z=-2

asked by Anonymous on December 4, 2016
75. Math

Use substitution to solve the system of equations given below. 8x - 4y = 16 2x - y = 4

asked by Anon on October 25, 2013
76. Math

What does it mean to solve a system of equations like y=x^2+4x-5 and y=x-1 graphically?

asked by Angie on May 25, 2009
77. Math

Solve each system of equations using substitution. 1.) x+3y=-4 y+x=0 2.) y=2x+3 5x-y=-3 3.) 2y=-4x 4x+2=-11

asked by Jordaine on September 19, 2012
78. math

Solve the following system of equations using matrices x = -2y + 6 2x + 2y = 16

asked by kailin on July 15, 2011
79. algebra

solve each system by substitution 1. 6x-3y=-33 2xty=-1 2. 2x-y=7 3x-2y=10 3. 4x=8y 2x+5y=27

asked by alex on January 8, 2013
80. algebra 2

solve each system by substitution 1. 6x-3y=-33 2xty=-1 2. 2x-y=7 3x-2y=10 3. 4x=8y 2x+5y=27

asked by raul on January 8, 2013
81. MATH 101

How do you solve system of equation problem. example x+3y=32 -3x+2y+3 and x+y=6 x-y=-9

asked by Ann on October 26, 2011
82. math

solve each system of equations by graphing y=x+1 y=3x-7

asked by gabby on January 18, 2011
83. math

Use linear combinations to solve the system 3x − y = −4 −6x + y = 34 The value of x is The value of y is

asked by Carter on April 6, 2010
84. Substitution

Solve each system of equations by substitution: x^2 - y +2 = 0 4x = 14 -y y + 2x = x^2 - 6 x + y - 3 = 2x^2

asked by Anonymous on July 9, 2018
85. math

Solve the system by addition or substitution.3x + 6y = 0 , x=2/3

asked by amy on January 25, 2008
86. math

Solve the system x^2+(y-3)^2-9=0 x+y-1=0 Substitute 1-x for y in the first equation. x^2 + (x+2)^2 = 9 4x + 4 = 9 Take it from there

asked by Angie on March 5, 2007
87. math

Solve this system of inequalities graphically 3-y1, y

asked by sarah on January 23, 2008
88. algebra

Solve the system of linear equations    x − 2y + 3z = 7 4x + 5y + z = −1 −x + y − 2z = −4 What is the value of z, y, and x?

asked by imani on July 9, 2016
89. Math

1/2z - 1/4w = 1/6 1/2z + 1/4w = 1/6 Solve the system of equations algebraically.

asked by Blue on September 29, 2011
90. math

solve each system of equations by graphing y=-1/2x+5 y=3x-2

asked by Alexius on April 8, 2013
91. algebra

Solve the system of equations using substitution. y = 2x + 3 y = 3x + 1

asked by Nestor on December 21, 2012
92. algebra

Solve the system of equations using substitution. y = 2x – 10 y = 4x – 8

asked by Laura on December 21, 2012
93. algebra

Solve the system of equations using substitution. y = x + 6 y = –2x – 3

asked by Laura on December 21, 2012
94. Algebra

Solve the system by substitution: -4.5x-2y=-12.15 3.25x-y=-0.75

asked by Taylor on October 6, 2016
95. math

I'm a little confused on how to solve this system of equations. 5a=5 6b-3c=15 2a+7c=-5 Thanks

asked by Anonymous on December 31, 2008
96. finitie math

2x+y+z=6 -3x-4y+2z=4 x+y-z=-2 solve the system of all variables using a matriz

asked by crystal on June 26, 2009
97. precalculus

8. Solve the system of equations shown below. .3/4x-5/2y=-9 .-x+6y=28 x = 21.5, y = 8.25 x = -8, y = 6 x = 8, y = 6 x = -21.5, y = 8.25

asked by Anonymous on November 29, 2016
98. Math

How do i solve this system algebraicly? 3x + 8y = 16 5x + 10y = 25

asked by Chris on May 25, 2010
99. algebra 2

solve each system of equation by using a table 1. y=3x-4 y=-2x+11 2. 4x-y=1 5x+2y=24 how do you do these?

asked by anonymous on September 26, 2014
100. algebra 2

Solve esch system by substitution. 3c+2d=2 d=4

asked by tamara on March 10, 2011