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Direct Variation
y is directly proportional to x or y varies directly as x:
$y = kx$
Inverse Variation
y is inversely proportional to x or y varies inversely with x:
$y = \dfrac{k}{x}$
Joint Variation
y is directly proportional to x and z:
$y = kxz$
Variation to nth power of x and mth power of z
y is directly proportional to the square of x and varies inversely to the cube of z.
$y = \dfrac{kx^2}{z^3}$
