Question

Using elimination, what is
-4x+2y=-12
4x+8y=-24

Answer 1

x = 1.2 and y = -3.6 → (1.2, -3.6)

Explanation:

`\underline{+\left\{\begin{array}{ccc}-4x+2y=-12\\4x+8y=-24\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad\qquad10y=-36\qquad\text{divide both sides by 10}\\.\qquad\qquad\boxed{y=-3.6}\\\\\text{Put the value of y to the first equation}\\\\-4x+2(-3.6)=-12\\-4x-7.2=-12\qquad\text{add 7.2 to both sides}\\-4x=-4.8\qquad\text{divide both sides by (-4)}\\\boxed{x=1.2}`