PLEASE HELP OR IM gonna FAIL

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 18% discount on a watch saved a shopper $72. find the price of the watch before the discount

How does the graph of y = 3x compare to the graph of y = 3-x?