Which statement is true about the graphs of the two line y=-4/5x+2 and y=5/4x-1/2

This question awards 100 ! i really don’t want to fail i will also mark you !

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.

8.74 rounded to the nearest whole number