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Solve the following system of equations, using the substitution method: 4x - 5y = 3 8x + 15y = - 24
4x - 5y = 3 8x + 15y = - 24 4x - 5y = 3; -5y = -4x + 3; (-5y = -4x + 3)/(-5); y = 4/5x - 3/5; 8x + 15(4/5x - 3/5) = - 24; 8x + 12x - 9 = -24; 20x - 9 = -24; 20x = -24 + 9; 20x = -15; x = -15/20 = -3/4; 4(-3/4) - 5y = 3; -3 - 5y = 3; -5y = 3 + 3; -5y = 6; y = -6/5; The solution set is (-3/4, -6/5)
harshkumar742|Points 54|
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Asked 4/28/2013 4:41:31 AM
Updated 3/29/2015 5:09:12 AM
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This answer has been confirmed as correct and helpful.
Edited by Andrew. [3/29/2015 5:09:11 AM], Confirmed by Andrew. [3/29/2015 5:09:12 AM]
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Questions asked by the same visitor
Solve the following system of equations, using the graphing method: x + 2y = 4 2x - y = 3
Question
Not Answered
Updated 10/1/2014 6:22:14 AM
1 Answer/Comment
The solutions for the systems x + 2y = 4, 2x - y = 3 are x = 2, y = 1.
Multiply x + 2y = 4 by -2:
-2x - 4y = -8;
(-2x - 4y = -8) + (2x - y = 3):
-5y = -5;
y = 1;
Solve for x:
x + 2(1) = 4;
x + 2 = 4;
x = 4 - 2;
x = 2
Added 10/1/2014 6:22:14 AM
This answer has been confirmed as correct and helpful.
Solve the following system of equations: x + 2y = 4 2x - y = 3 Here are the multiple choices: (2, 1) (-1, -3) (0, 4) (5, -2)
Question
Not Answered
Updated 3/1/2015 2:59:43 AM
1 Answer/Comment
The solution set for the systems x + 2y = 4, 2x - y = 3 is: (2, 1)

(x + 2y = 4) * (-2);
-2x - 4y = -8;
(-2x - 4y = -8) + (2x - y = 3);
-5y = -5;
y = 1;
x + 2 = 4;
x = 4 - 2;
x = 2
Added 3/1/2015 2:59:43 AM
This answer has been confirmed as correct and helpful.
Solve the following system of equations, using the elimination method: 5x + 3y = -7 7x - 3y = 55
Weegy: Solve the following system of equations, [ using the elimination method: 5x + 3y = -7 7x - 3y = 55 Answer 5x + y = -17 - - - > 15x + 3y = -51 {multiplied top equation by 3} 7x - 3y = -37 15x + 3y = -51 {new top equation} 7x - 3y = -37 {original bottom equation} - - - - - - - 22x = -88 {added the two equations together} x = -4 {divided both sides by 22} 5x + y = -17 {top equation} 5(-4) + y = -17 {substituted -4, in for x, into top equation} -20 + y = -17 {multiplied 5 by -4} y = 3 {added 20 to both sides} x = -4 and y = 3 Source ] User: Here are the multiple choices: (4, -9) (3, -6) (0, -14) (7, 3) (More)
Question
Expert Answered
Updated 6/23/2014 10:41:41 PM
1 Answer/Comment
5x + 3y = -7
7x - 3y = 55
adding up equations the result is:
12x = 48
x = 48/12 = 4
5(4) + 3y = -7
20 + 3y = -7
3y = -7 - 20 = -27
y = -27/3 = -9
The solution for the system 5x + 3y = -7 7x - 3y = 55 is (4, -9)
Added 6/23/2014 10:41:41 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [6/23/2014 11:34:32 PM]
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