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y varies directly as x

y=kx, where k is any constant

y = 4 when x=-2

4 = k (-2)

4 =-2k

k=-2

Therefore, y=-2x

When x=30

y = -2(30) = -60

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Q: Suppose y varies directly as x if y equals 4 when x equals -2 what is y when x equals 30?
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