# If 9x-13=-31, how do you find the value of x-8?

Oct 19, 2016

$x - 8 = - 10$

#### Explanation:

$9 x - 13 = - 31$

Add $13$ to each side.

$9 x = - 31 + 13$

$9 x = - \left(31 - 13\right)$

$9 x = - 18$

Divide both sides by $9$.

$x = - 2$

Since we have to find the value of $x - 8$, subtract 8 from each side.

$x - 8 = - 2 - 8$

$x - 8 = - \left(2 + 8\right)$

$x - 8 = - 10$