54 blue marbles 24 red marbles and 18 yellow marbles arranged in equal groups

What percent of the circle below is shaded?

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.

An equation in slope-intersept form the lines that passes thought (-8,1) and is perpindicular to the y=2x-17.