Suppose y varies directly with x. If y = –4 when x = 8, what is the equation of direct variation? | Complete the steps to write the equation of direct variation.

For direct variation, the equation has the form y = kx, where k is the constant of variation. Using y = –4 and x = 8 gives k = –4 ÷ 8 = –1/2. Therefore, the equation is y = (–1/2)x, choice D.

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