Question

Given the system of equations.



Which of the options represents the resulting equation after an equivalent expression for y is substituted into the second equation?

4 x + 4 x - 8 = 8
6 x - 9(-4 x + 8) = 12
6(4 x - 8) - 9 y = 12
6 x - 9(4 x - 8) = 12

Answer 1

Solve the first for y: 4x + y = 8 → y = 8 − 4x = −4x + 8. Substitute into 6x − 9y = 12:

6x − 9(−4x + 8) = 12.

So the correct option is: 6 x - 9(-4 x + 8) = 12.