Write an equation of direct variation that includes the point (9,-12)

Since it must include the point (9,-12) we know that if we substitute x=9 and y=-12 into y = kx we will have a true equation, so we do that: y = k·x -12 = k·9 -12 = 9k We divide both sides by 9 to solve for k: = = k So the constant k is , and so we substitute that for k in y = k·x and get the y = x  

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Y= -4/3x
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25% increaseplus i think decrease i only know increase: ((