When x is equal to 2 , y is equal to 50 and when x is equal to 4 , y is equal to 100 Which direct variation equation can be used to model this function?

In a direct variation, y = kx, where k is the constant of variation. Using x = 2 and y = 50 gives k = 50 ÷ 2 = 25; the other point also gives 100 ÷ 4 = 25. Therefore, the equation is y = 25x, choice C.

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