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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=kx
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=kx2z3
