This is very confusing. view picture

Side XZ corresponds to side AC, the ratio is 18:12.

To find the scale factor, divide 18 by 12.

18 ÷ 12 = 1.5

Multiply the length of side BC by 1.5 and it should equal the length of side YX, 15. This is how you know 1.5 is the scale factor.

10 × 1.5 = 15

Divide 12, the length of XY, by 1.5 to find the length of AB.

12 ÷ 1.5 = 8.

Side AB's length is 8.

Hope this helps :)

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i hope this answer you! if you have any further questions or concerns, feel free to ask! : )

step-by-step explanation:

mark brainliest!