First, you need to find the slope of HI.
Find two points. (On the line)
(-5,5) (1,9) I’m just going to use the points for H and I.
Plug it into the slope formula.
M= (y2-y1)/(x2-x1)
M= (9-5)/(1-(-5) Switch the sign to be positive, two negatives equal a positive.
M= 4/6
Now, you just need to find the opposite reciprocal for the slope of the perpendicular line.
Flip 4 and 6. Make it negative.
-6/4
Simplify.
-3/2 or -1.5
I hope this helps!
~kaikers