What is the equation of the line perpendicular to #y=21/4x # that passes through # (-3,5) #?
4x + 21y = 93
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.