y is inversely proportion to the square of x. y=10 when x=5. Express y in terms of x.
y is proportion to 1/x2. This can be written as y=k/x2 where k is a constant of proportionality. Given that y=10 when x=5, k can be found as yx2 which is equal to 25. Therefore; y=25/x2.
EH
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