When x = 2, y = 50 and when x = 4, y = 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, so the equation is y = 25x. It also gives y = 100 when x = 4, confirming choice C, “y = 25x.”

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