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direct variation
y =kx
substitute y and x to find k
-6 = k(9)
divide by 9
-6/9 =k
k = -2/3
y = -2/3 x
now substitute y =-3 to find x
-3 = -2/3 x
multiply by -3/2 on each side
-3 * -3/2 = -3/2 * -2/3 x
9/2 = x
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