# How do you write an equation of a line given P(3, -4), slope is undefined?

Apr 12, 2017

See the entire solution explanation below:

#### Explanation:

A line with an undefined slope is a vertical line.

A vertical line will always have the same value of $x$ for every value of $y$.

The value of $x$ in point $P$ given in the problem is $3$

Therefore, the equation of the line is:

$x = 3$