# How do you solve abs(-3r)=9?

Nov 11, 2016

The solution to the problem is $r = 3$ and $r = - 3$

#### Explanation:

To solve this equation you need to solve two equations because of the absolute value signs. These equations are:

1) -3r = 9
2) -3r = -9

Solving equation 1 gives:

$- 3 r = 9$

$\frac{- 3 r}{-} 3 = \frac{9}{-} 3$

$r = - 3$

Solving equation 2 gives:

$- 3 r = - 9$

$\frac{- 3 r}{-} 3 = \frac{- 9}{-} 3$

$r = 3$