When x is 1, y is 5. If x is 2, y is 10. If x is 3, y is 15. Then you can draw a straight line and find all the other points.
Perpendicular slopes are opposite reciprocals
-3=1/10x + 2
-5=-1/10x
50=x
y = -1/10x + 2
I think the answer is 78.53982
Hope it helps!
A value we can put in place of a variable (such as x) that makes the equation true.
8/13 IS THE ANSWER TO YOUR QUESTION