Question 762671
fisrt we need to find the equation of the line.  fill in y=mx +c for both points you know
3=2m+c
-3=4m+c

now solve by simultaneous equations.  first multiply the fisrt equation by 2
6=4m +2c
then take away the second equation from this to get
9=c

now go back to any of the two equtions, substitute c=9 to get m =-3
thus the equation is y=-3x +9
now a line perpendicular to it has a gradient - the gradient , so
y=3x+9
so the answer is 3