y is inversely proportional to d^2
when d = 5, y = 20
d is directly proportional to x^2
when x = 4, d = 80
find a formula for y in terms of x.
give your answer in its simplest form.
thank you!
+37157 y = k/d^2
20 = k/(5)^2
k = 500
y= 500/d^2 (1)
x^2 = md
4^2 = m(80)
m= 1/5
d= 5x^2 (2)
Sub 2 in to 1 y = 500/(5x^2)^2 = 20/x^4
