# How do you write a general formula to describe each variation if the cube of z varies directly with the sum of the squares of x and y; z=2 when x=9 and y=4?

The general formula to describe the variation is z = k(x^2 + y^2), where k is the constant of variation. To find the value of k, substitute the given values of z, x, and y into the formula and solve for k. In this case, z = 2, x = 9, and y = 4.

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