5x + 2y = 8/x + y = 4 If you want to solve the system of equations by addition, which of the following could you do? Multiply the second equation by 5 and add. Multiply the second equation by 2 and add. Multiply the second equation by -2 and add.
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5x + 2y = 8, x + y = 4 If you want to solve the system of equations by addition, Multiply the second equation by -2 and add. (x + y = 4) x (-2) = (-2x - 2y = -8) + (5x + 2y = 8) = 3x = 0; x = 0/3; x = 0; Plug x = 0: 5(0) + 2y = 8; 2y = 8; y = 8/2; y = 4
Question
Updated 9/22/2014 2:28:52 PM
Rating
8
5x + 2y = 8, x + y = 4 If you want to solve the system of equations by addition, Multiply the second equation by -2 and add.
(x + y = 4) x (-2) =
(-2x - 2y = -8) + (5x + 2y = 8) =
3x = 0; x = 0/3; x = 0;
Plug x = 0:
5(0) + 2y = 8;
2y = 8; y = 8/2; y = 4

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