# 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 28
1. ## Physics

In Figure 10-20, the magnitude of the force necessary to stretch a spring is plotted against the distance the spring is stretched. Figure 10-20 (a) Calculate the slope of the graph, k, and show that F = kd, where k = 25 N/m. (b) Find the amount of work

asked by Claire on October 25, 2011
2. ## Chemistry

A 10.0-mL solution of 0.300 M NH3 is titrated with a 0.100 M HCl solution. Calculate the pH after the following additions of the HCl solution: a) 0.00 mL b) 10.0 mL c) 20.0 mL c) 30.0 mL d) 40.0 mL **I know how to solve the problem but I keep getting

asked by Sandhya on March 21, 2015
3. ## algebra 2

solve the triangle triangle BCD

asked by Tristan on May 5, 2010
4. ## Chemistry

The approximate concentration of a hydrochloric acid solution is 0.5M. The exact concentration of this solution is to be determined by the titration with 0.5M solution of sodium hydroxide. A 10.00 ml of HCl solution was transferred by pipet to an

asked by Ericka on May 17, 2015
5. ## Introduction to Algebra MAT 221

Factor each polynomial completely. Show all work. Show each step. x^4 - x^3.

asked by sandra on June 6, 2013
6. ## Math-college

Explanation of why the following statement is incorrect. (x + 3)(x -4) < 7, and explain why it is incorrect. To solve (x + 3)(x -4) < 7, start by setting (x + 3) = 7 and (x - 4) = 7. Now solve the inequality. Provide a detailed explanation of why using

asked by Mike on July 24, 2017
7. ## Algebra 2(check pt 4)

1)Cramer's Rule is used to solve the system of equations:3m-5n=12,4m+7n=-5 Which determinant represents the numerator for n? answer=[12 -5] [-5 7] 2)Cramer's Rule is used to solve the system of equations:3x-y+2z=17,4x+2y-3z=10,and 2x+5y-9z=-6 Which

asked by erin on July 28, 2007
8. ## math

Describe two ways to determine whether or not a given point is a solution of a line. Which way is more accurate? Why? The only practical and fast way is to substitute the coordinates of the point into the equation. If the equation is "true", then it is a

asked by heather on July 30, 2007
9. ## Physics

Heat of 30 kcal is supplied to a system and 4200j of external work is done on the system so that it's volume decreases at constant pressure.what is the change in its internal energy (J=4200 j/kcal)

asked by Shaik Tanaaz on August 18, 2016
10. ## Math

A system of inequalities may have no solution, but is there a case where there might only be one solution?

asked by Emily on June 2, 2014
11. ## Algebra 1

Tell whether the system has one solution, infinitely many solutions, or no solution. 1.) y= 1/2x +3 2y -x =6 2.) x= -7y + 34 x+ 7y =32

asked by Lindsey on February 24, 2015
12. ## math

tell whether the system has one solution, infinitely many solutions, or no solution: y=3x-14 y-x=10

asked by Taylor on January 14, 2013
13. ## information technology

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 small budget. Write a 4-5 page

asked by titus on April 10, 2019
14. ## chemistry

For a certain change, value of Delta U is -2.37 kJ. During the change, the system absorbs 650 joules. How much work did the system do? Please help! I get 3.02 but is not correct!!

asked by Mary on March 1, 2013
15. ## calculus

solve the logarithmic equation. be sure to reject any value of x that is not in the domain of the orginal logarithmic expression. In square root x+7=2 what is the exact solution? a.)the solution set is ? b.)there are infinitely many solutions c.)there is

asked by Brock on January 1, 2013
16. ## programming

3. Your company needs to depreciate its assets. The accountant wants to record the purchase price, the useful life, and the estimated salvage value. Your program should be able to depreciate by the straight-line method. For example, a computer system was

asked by tina on February 15, 2013
17. ## Chemistry, #7

The pH of a 1.00 x 10^-3 M solution of pyrrolidine is 10.82. Calculate Kb. I know pyrrolidine is acidic because of the pH, and I know that tells me something about the Ka which in turn tells me something about the Kb. What does it tell me? Where should I

asked by Taasha on August 5, 2007
18. ## physics help!

When a gas follows path 123 on the PV diagram in a rectangle shape labeled 1234 cycle, 449 J of heat flows into the system and 179 J of work is done. What is the change in the internal energy of the system? * I keep coming up with 270 but this is

asked by emily on November 18, 2012
19. ## Chemistry

describe the preparation of 12 mL of a 0.050 M solution of each of the halogens, using the reactions in the preceding question. Available to you are solid Ca(OCl)2; 0.20 M solutions of NaCl, NaBr, NaBrO3, and CuSO4; a 0.40 M solution of NaI; a 0.50 M

asked by Jana on October 25, 2016
20. ## algebra

I need to find a solution by substitution method

asked by cynthia on March 20, 2010
21. ## Franklin High

4x - y = 2, 9x - 2y = 8 find solution by substitution method

asked by liz on June 12, 2013
22. ## math

How would you use the substitution method to answer 1/3x-2=1 x-6y=3, and what would be the solution?

asked by Penny on November 2, 2011
23. ## Math

solving using the solution method. x+10y=41 x+9y=37 =

asked by Ms.Ellis on July 2, 2011
24. ## math

solution :2y+3=y+1using balancing method

asked by David on May 8, 2019
25. ## calculus

I got half of this problem wrong and I DO NOT know where and how to fix. I cannot use my calculator and have to show my work. Question: You have a 500 metre roll of fencing and a large field. You want to construct a rectangular playground area. a.) using

asked by jj on December 18, 2013
26. ## Chem

Can anyone show me how to balance: Ce+4 +H3AsO3 ==> Ce+3 + H3AsO4 using the half-reaction method?

asked by Chris Pike on May 21, 2010
27. ## Accounting 11

What all goes on cash flow statement using an indirect method? How would it show on the sheet?

asked by Sonya on February 24, 2008
28. ## pre - CALCULUS

Complete the following: (a) Use the Leading Coefficient Test to determine the graph's end behavior. (b) Find the x-intercepts. State whether the graph crosses the x-axis or touches the x-axis and turns around at each intercept. Show your work. (c) Find the

asked by Ciara on April 10, 2015
29. ## Chemistry

work out the [OH-], [H+] and pH of the solution formed when 0.500L of 0.250 M hydrochloric acid solution is mixed with 0.500 L of a 0.250 M calcium hydroxide solution.

asked by Megan on July 22, 2012
30. ## Chemistry

I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 :

asked by Jennie on April 30, 2015
31. ## Chemistry

I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 :

asked by Jennie on April 30, 2015
32. ## Chemistry Dr. Bob

I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 :

asked by Jennie on April 30, 2015
33. ## chemistry

There are four main methods of making salts: Acid + Metal, Acid + insoluble base, Acid + alkali and solution of salt A + solution of salt B. a. a student wanted to make some sodium sulfate. i. which method would be best to use? ii. why? iii. which

asked by Chloe on April 6, 2008
34. ## physics

5kg particle is atteched at a rim of arotating wheel of radius 2m. the wheel completes each revolution in 3 seconds. The total moment of inertia of the system(I partics+I wheel) is 2kg.m^2 A.determine the rotational kinetic energy of the system? B.the work

asked by degefech on November 23, 2015
35. ## CHEM

how do I work this question out?: 50.00g of NaCl are dissolved in water to give a solution that contains 2.500% NaCl by mass. The density of the solution is 1.030g/mL. The volume of the solution is: a)941.8mL; b)1.942L; c)2.500L; and, d)50.0mL. I know the

asked by K on December 11, 2006
36. ## Help

Is there a website that will help me solve this? I can't find anything. I'm coming up with x=1/3 but I feel I'm doing it wrong. Find all real number solutions to (cubed root 3x-8)-1=0 If there is more than one solution, separate them with commas. If there

asked by Hannah on January 27, 2011
37. ## Math

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?200 feet in 5 seconds. Show your work. Part B How many seconds would it take for the ball to travel 25 feet? Show

asked by Anonymous on March 19, 2015
38. ## help...solving a polynomial....algebra

solve this please....help me....12x(squared)+7x-10 Do you wish to factor this trinomial? If so, the factors are: (4x + 5)(3x - 2) You can use the FOIL method to check. If this is supposed to be an equation: 12x^2 + 7x - 10 = 0 ...then set each factor equal

asked by Taylor on January 18, 2007
39. ## Math

Here is the question that I need to answer: Mr.T wanted to remodel his box, He wanted to make it the shape of a perfect regular dimension. A.) How many total degrees would the interior of Mr.T's decagon have? SHOW WORK. B.)How many degrees would each angle

40. ## Chemistry revision

all these questions I got wrong on my homework today ...I'm trying to find out why and what the correct answers were .. please help How many grams of solute are required to make a 504 mL solution of copper (I) nitrate with a concentration of 1.3317 M?

asked by Tif on April 29, 2013
41. ## Math

A) A rectangle has perimeter 64 cm and area 23 cm^2. Solve the following system of equations to find the rectangle's dimensions. length=23/width length + width = 32 B) Solve the system of equations x^2+y^2=1 xy=0.5

asked by Christine on June 7, 2009

Andrew claims that a wooden bookend in the shape of a 45°- 45°- 90° right triangle has side lengths of 5 in., 5 in., and 8 in. Is he correct? If so, show the work and if not, show why not.

asked by Ryan on May 10, 2009
43. ## chemistry

Something that will lower the freezing point of water to -3.7 degrees Celsius if one mole were placed in 1000 grams of water? To solve this I know I have to use the equation Tf= IKfm, Tf= 3.7, but how I go about the problem there if I don't know Kf or the

asked by A on May 27, 2014
44. ## Physics 221

A 20g particle is moving to the left at 30 m/s. How much net work must be done on the particle to cause it to move to the right at 30 m/s. The answer is 0J of work, and i understand the method of equations, but i don't understand the logic behind it.

asked by K on December 8, 2009
45. ## Algebra

If you have these three origins: (0,0) (0,952) (863,0) How do you find the last point where the two lines intersect? Would really appreciate the help. Thanks. Parker, I'm not quite sure what the question asks. Three origins? Is this standard analytic

asked by Parker on July 12, 2006
46. ## math

Ex 2: -2x+7=22 -2x+7-7=22-7 -2x=15 -2x/(-2)=15/(-2) I do not have to switch the equality sign. Even if I did it would not look any different. x=-7.5 Check: -2x+7=22 -2(-7.5)+7=22 my solution is that x=-7.5 so I will just put that in to see if it works.

asked by Anonymous on September 22, 2010
47. ## Computer Science

I need help with these assignments. "Write a program to read a list of exam scores (integers in the range 0 to 100) and to output the total number of grades and the number of grades in each letter-grade category (90 to 100 = A, 80 to 89 = B, 70 to 79 = C,

asked by Jim on May 21, 2008
48. ## Math/Euler's Method

Consider a cooling cup of coffee whose initial temperature is 205°. The room temperature is held at 70°. Suppose k = 1/16. Let y be the temperature, and y' its time derivative. ----------------------------------- I have the differential equation: y' =

asked by COFFEE on June 7, 2007
49. ## calculus

A question on my math homework that I can't seem to solve... Rotate the region bounded by y=x^2-3x and the x-axis about the line x=4. Set up the integral to find the volume of the solid. I'm pretty sure that the integral is in terms of (dy), and has bounds

asked by Michelle on January 24, 2009
50. ## algebra 1

A local citizen wants to fence a rectangular community garden. The lengthof the garden should be at least 110ft., and the distance around should be no more than 380 ft. Write a system of inequalities that models the possible demensiopns of the garden.

asked by Aubrey on May 21, 2013
51. ## math

A local citizen wants to fence a rectangular community garden. The length of the garden should be at least 110 ft, and the distance around should be no more than 380 ft. Write a system of inequalities that models the possible dimensions of the garden.

asked by Jane on December 29, 2011
52. ## CHEM!

Okay well I suddenly got confused for a lab I did We took pH meter than we calibrate it. Then we measure the pH of the acetic acid solution, which was used to determine the Ka of the acetic acid using the first method. We made a 1M solution of NaOH which

asked by Linda on May 9, 2007
53. ## chemistry

Can you check what I did below? On the first problem, I am not sure if I am suppose to add a negative to the first part of the heat loss of water like so -[C(sp)m(w)deltaT(w)]. On the second problem, part(a), I am not sure if I am using the mass from the

asked by Anonymous on July 19, 2008
54. ## Calculus 1

Use Newton's method with initial approximation x1 = −2 to find x2, the second approximation to the root of the equation x^3 + x + 1 = 0. *I got -1.307692 for my answer but it said that was wrong, so then I tried rounding it to two decimal places and got

asked by TayB on November 12, 2015
55. ## Physics

There are two ways to find how much work is done voercoming friction. One method entails knowing the force overcoming friction. What other calculation could be done to find this wasted work?

asked by Hayley on December 16, 2007
56. ## algebra

A man invested half of his money at 5%, one-third of his money at 4%, and the rest of his money at 5.5%. If his total investment income was \$570, how much had he invested? and please show me the solution to solve this problem. thanx

asked by aj on February 25, 2012
57. ## Physics Thanks

Please help... Let g be the acceleration due to gravity at the surface of a planet of radius R. Which of the following is a dimensionally correct formula for the minimum kinetic energy K that a projectile of mass m must have at the planet's surface if the

asked by Kelly on May 13, 2007
58. ## Math

As a restaurant owner there are many decisions that you need to make on a daily basis, such as where to keep inventory levels. You wish to replenish your stock of dishes by purchasing 250 sets for your restaurant. You have two dish design from which to

asked by Mary Troy on November 6, 2010
59. ## Math

Here's a couple examples from my homework. If someone could help me solve this by showing me step by step what to do, it would be so great. Also, any websites that would show me the steps too. Thanks so much. I have to get all my work done by tomorrow and

asked by Tessa on March 15, 2009
60. ## math exam tommrow review

the ABC cell phone company offers a plan that includes a flat rate fee of \$29 per month plus a \$0.12 charge per minute.write an equation to find C, the total monthly cost for m mintues. then solve the equation for m=50. please show work.

asked by ellis on December 18, 2012
61. ## algebra 2

solve the syatem using the substitution method 4x - 5y = - 3 -x + 2y = 3

asked by Anonymous on October 13, 2009
62. ## algebra

solve by the substitution method 9x + 5y = -25 x = 7 - 3y Could someone help with steps here also?

asked by algebra yuck on September 12, 2009
63. ## Algebra

x^3 -5x-6=0 can you please tell me how to solve this algebraically? I tried using grouping method x(x^2-5)-6=0, I'm not sure what to do next.

asked by Anonymous on June 26, 2014
64. ## math

If I use the method of completing the square on 3w^2-4w+1=0 How would I solve??

asked by I need some explaining on April 20, 2010
65. ## maths

Solve 4x-6=14 use trial and improvement method?

asked by poppy👌🤔 on May 8, 2019
66. ## Math

Solve x^2-6x+9 Using competing the square method

asked by Simon on February 28, 2018
67. ## Maths

solve y^2-4y=13 using completing the square method

asked by Evans on April 17, 2018
68. ## math

Equations solve by matrix method (1) x-y+3z=2 (2) 2x+y+2z=2 (3) -2x-2y+z=3

asked by nakul on July 26, 2015
69. ## math

I have to add 1+2+3+4+5.....all the way to 1000. What method should I use to solve it?

asked by Celest on July 7, 2013
70. ## maths

Px^2-(2p+q)x+(p+q)=0 solve by completing of square method

asked by danmarkiburi on April 8, 2014
71. ## Algebra

Solve using the substitution method. -5x + y = 16 9x + 13y = 60

72. ## math

Solve using the substitution method: 7x+2y=-37 and -5x+y=44 what are the solutions?

asked by tera on February 10, 2009
73. ## Algebra

I solve this equation by the substitution method 7x-4y=13 x=3 and I got y=2 and x=3 am I right. Thanks

asked by Al on September 16, 2011
74. ## math

x-y+z=3 2x-y+z=4 x+2y-z=-1 solve in Gaus-Jordan method

asked by dd on July 13, 2013
75. ## math

solve the equation in substitution method 2m+n=0 m+2n=3

asked by damola on May 4, 2017
76. ## math

Equations solve by matrix method (1) x+y+z=3 (2) x+2y+3z=4 (3) 2x+4y+9z=6

asked by nakul on July 26, 2015
77. ## algebra

Solve using the substitution method. -8x + y = 18 9x + 13y = 8

asked by Anonymous on January 13, 2015
78. ## Algebra

The problem is 9x+4y=-12 x=26-5y Solve by substitution method

asked by Vic on July 3, 2011

solve using the substitution method. -8x + y = 18 9x + 13y = 8

asked by slomo on January 11, 2015
80. ## math

1/4v=5 Use the substitution method to solve this problem.

asked by Janey on May 1, 2013
81. ## algebra

how do u solve an equation using the the graphing method...for example x-y=2 and -2x=2y=2

82. ## Algebra 2

solve using substitution method: x=-5 y=2 z=0 x+3y-z=1 -4x-2y+5z=16 7x+10y+6z=-15

asked by Emily on June 10, 2015
83. ## math

solve (x-1) (d^2 y)/〖dx〗^2 +2dy/dx=0 using series method

asked by yusuph on July 13, 2016
84. ## algebra

solve using ac method 10a^2-27ab+5b^2

asked by Stephanie on March 9, 2015
85. ## Algebra

8s+12t=16, 6s+9t=12 solve using the substitution method

asked by Ninna on August 20, 2010
86. ## Algebra

How do I solve by the substitution method? 7x +6y=13 x= 35-5y. I need help figuring this out.

asked by A.W. on March 22, 2009
87. ## mathematics

solve m2+6m+7 using completing the square method

asked by anthony on November 4, 2016
88. ## algebra

using cross multiplication method solve 3x+5y=25 , 7x+6y=30

asked by manikandan on March 20, 2016
89. ## Math

metrix method solve equation 2x-y-3z=9 ,x+y+z=6 ,x-y+z=2

asked by Vivek on July 19, 2018
90. ## algebra

Solve by the subsitution method. 2x+4y=-6 -3x+y=23 y=23+3x 2x +4(23+3x)=-6 2x +92 +12 x =-6 x=7 y= 23 I am lost after this could some one help me

asked by Jonnie on April 2, 2009
91. ## algebra

solve for x using the substitution method -8x + y = 18, 9x + 13y = 8

asked by Anonymous on January 13, 2015
92. ## Algebra 2

Solve in factoring method: x^2+9x+11= 7 plz help me with this.

asked by Anonymous on September 23, 2010
93. ## math156-proportions

I can solve the proportions by any method. can anyone help me understand this. #1 4/15 = x/5 #2 x/3 = x+10/6

asked by Christy on September 14, 2009
94. ## algebra 1

how do you solve this equation with the substitution method. 1) 6x + 4y = 6/5

asked by debbie on August 21, 2012
95. ## algebra

solve by the subtitution method. 2x+3y=8 -6x+y=36 I came up with (-2,-6) am I close

asked by neicey on October 30, 2009
96. ## math

solve by the gauss-jordan method x+y+z=6 3x+2y-z=4 3x+2y+2z=11

asked by Diahann on October 11, 2009
97. ## Math 116a Fraction

Solve using the multiplacation method -2x>1/9 {x x } I have no clue how to do this?

asked by Katie A on September 29, 2011
98. ## Math Help PLease Fast!!!!!!!!!!!!!!

Graph the system of inequalities. Then use your graph to identify the point that represents a solution to the system. x > ¨C2 y ¡Ü 2x + 7 A. (¨C1, 6) B. (1, 11) C. (¨C1, 4) D. (¨C3, ¨C1)

asked by Lola on December 12, 2012
99. ## Math

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 _____. I'm thinking it could be X=3

asked by Student on December 11, 2015
100. ## math

I need help with these three problems. They are on a Study Guide and I need some refreshing up of how to do them. 17. Solve the equation using the zero product property... -8n(5n+3) 19. Solve the equation by factoring 5z^2-2z-3=0 20. Solve the equation by

asked by Amy on May 26, 2009