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Direct Variation: A function in the form y = kx, where k is the constant of variation You can say that y varies directly as x A direct variation must also pass through the origin ie) if x=0 then y=0 y y y y k 1 and k 2 1 2 x1 x2 x1 x2 k is also called the constant of proportionality, and y is said to be directly proportional to x y1 y2 x1 x2 Inverse Variation: Is a function defined by an equation of the k ,where x 0 x You can say that y varies inversely as x or that y is inversely proportional to x k is the constant of variation x1 y1 x2 y2 form: xy k , where k is a non-zero constant or y=