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Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.