how do I express y in terms of x when y = 4 and x = 2 when y is inversely proportional to x squared
If y is inversely proportional to x2, then we have y = k/x2 where k is a constant.
Since y = 4 when x = 2 we must have 4 = k/22 so that k = 4*22 = 4*4 = 16.
Hence y = 16/x2
