Question 1114951
***************SOLUTION WRONG**********GIVEN POINT NOT ON THE PARABOLA**********

{{{dy/dx=2x}}}

{{{m=2*4=8}}}
Any line perpendicular will be slope  {{{-1/8}}}.


(4,5)
-
{{{y-5=-(1/8)(x-4)}}}

{{{y-5=-x/8+1/2}}}

{{{y=-x/8+1/2+5}}}

{{{cross(y=-x/8+5&1/2)}}}