# What is the equation of the line perpendicular to #y=21/4x # that passes through # (-3,5) #?

##### 1 Answer

Apr 12, 2016

4x + 21y = 93

#### Explanation:

In the form y = mx + c for the equation of a straight line, m gives the slope of the line.

For any line perpendicular to this line, the slope is the negative reciprocal

Here, m =

So, the equation of the perpendicular line through

This can be rearranged as 4x + 21y = 93.