# How do you solve 2x-3y=4 and x+4y=-9 using substitution?

Jun 7, 2018

$x = - 1 , y = - 2$

#### Explanation:

From the secon equation we get

$x = - 9 - 4 y$
plugging this in the first one

$2 \left(- 9 - 4 y\right) - 3 y = 4$
$- 18 - 8 y - 3 y = 4$
so

$- 11 y = 22$

$y = - 2$