The value of x when y = -27 is 9.
y varies directly as x
Therefore,
y ∝ x
y = kx
where
k = constant of proportionality
Let's find k when y = 9 and x = -3
y = kx
9 = -3k
k = 9 / -3
k = -3
Let's find x when y = -27
y = kx
-27 = -3x
x = -27 / -3
x = 9
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