# How do you solve and write the following in interval notation:  3x< -21?

Feb 14, 2017

$x < - 7 , \left(- \infty , - 7\right)$

#### Explanation:

To solve for x, divide both sides of the inequality by 3

$\frac{\cancel{3} x}{\cancel{3}} < \frac{- 21}{3}$

$\Rightarrow x < - 7 \text{ is the solution}$

$\text{Expressed in interval notation } \left(- \infty , - 7\right)$