# The slope of a line is -3. What is the slope of a line that is perpendicular to this line.?

##### 1 Answer
Jul 15, 2016

$\frac{1}{3}$.

#### Explanation:

Lines with slopes m_1 & m_2 are $\bot$ to each other $\iff {m}_{1} \cdot {m}_{2} = - 1$.

Hence, reqd. slope $\frac{1}{3}$.