If y varies directly with x and y is 9 when x is 5, what is x when y is -1

We use the fact that y = kx, where k is the constant of proportionality.

9 = 5k

9/5 = k

Now that we know k, we can find x when y = -1.

-1 = x(9/5)

-1/(9/5) = x

-5/9 = x

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