10)
4x-9
X + 18
Solve for x

x = 9

Step-by-step explanation:

The alternate interior angles theorem tells us that these two quantities must be the same.

Therefore,

x + 18 = 4x - 9

x + 18 + 9 = 4x

x + 27 = 4x

27 = 4x - x

27 = 3x

x = 9

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in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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