How do you solve the system of equations x- 4y = - 18 and 2x + y = - 9?

Jan 30, 2018

$x = - 6 \mathmr{and} y = 3$

Explanation:

Multiply the first equation by $- 2$

$- 2 x + 8 y = 36$

Add this equation to the second one. Thus

$9 y = 27$

So

$y = 3$

Replace $y$ in the first equation:

$x - 12 = - 18$

Thus

$x = - 6$