Question

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

Answer 1

Y= -4/3x
Hope this helps

Answer 2

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 answer: y = x

hope this helped good luck! :)