Is anyone any good at Pre-Algebra? I need help.

Use the elimination method to solve the systems of equations. choose the correct ordered pair. 7x+4y=39

What is the graph of the function fx x+2/x-3?

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.