A direct variation function contains the points negative 9 comma negative 3 and negative 12 comma negative 4 Which equation represents the function?

A direct variation has the form y = kx, where k is the constant ratio y/x. Using the point (−9, −3), k = (−3)/(−9) = 1/3. So the equation is y = x/3, which also gives −4 when x = −12.

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