Question 750882
Perpendicular Slope: -4 (flip the fraction and sign of 1/4)


{{{y = mx+b}}}


{{{5 = (-4)(4)+b}}}


{{{5 = -16+b}}}


{{{5+16 = b}}}


{{{21 = b}}}


{{{b = 21}}}


So the equation of the perpendicular line is {{{y = -4x+21}}}