Question

What is the equation of the perpendicular line to y=-1/4x+1 that passes through (5,21)

Answer 1

I hope this helps you


y=-1/4x+1 line slope is m=1/4


perpendicular lines slopes multiples -1


m.m'=-1

1/4.m'=-1

m'=-4


(5,21) x'=5 y'=21


m'. (x'-x)=y'-y


-4. (5-x)=21-y


-20+5x=21-y


-y=5x-41


y=41-5x