Question

Which equation would you use to form a zero pair and eliminate the y variable from the equation?A. 8x + 8y = 40B. -8x - 8y = -40C. 4x + 4y = 20D. -4x - 4y = -20

Answer 1

If we want to eliminate the y variable we can multiply the first equation by -4 and get

`-4x-4y=-20`

then the y variable has opposite coefficients, so we can eliminate it. Therefore, the answer is option D