Lydia writes the equation with a missing value. y is equal to 5 x minus square She puts a value in the box and says that the equation represents a direct variation. Which explains whether the equation could represent a direct variation?

A direct variation has the form y = kx, with no added or subtracted constant. In y = 5x − □, putting 0 in the box gives y = 5x, which is a direct variation with k = 5. A nonzero value in the box would leave a constant term.

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