# The variables x and y vary directly, how do you write an equation that relates x and y when given x = -18, y = -2, and then how do you find x when y=4?

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The equation that relates x and y when they vary directly is y = kx, where k is the constant of proportionality. To find k, you can use the given values of x and y. From x = -18 and y = -2, we have:

-2 = k * (-18)

Solving for k:

k = -2 / -18 = 1/9

So, the equation relating x and y is y = (1/9)x.

To find x when y = 4, you can use the equation y = (1/9)x and substitute y = 4:

4 = (1/9)x

Solving for x:

x = 4 * 9 = 36

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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