Perpendicular lines have negative reciprocal slop to each other.
So first solve for y.
Slope will be the coefficient of x in y=mx+c form.
m is the slope. Then negative reciprocal this slope and in this case the answer is -1/5
That is too easy 83.7333333333
Divide 1022.40 by 1420. oh and also × 100
the slope intercept is 3/2 if you want the transfered equation y=3/2x+8