If y varies inversely as the square of x and y equals 4 when x equals 5 findy y when x is 2?

Answer 1

y varies inversely as x2

so y = c/x2 for some constant c.

When x = 5, y = 4

So c = x2y = 100

that is y = 100/x2

Then, when x = 2, y = 100/4 = 25