Idont understand pls (random answer will be reported)

Matt had 5 library books. he checked out 1 additional book every week without retuening any books. whats the matching equation

Use the linear combination method to solve the system of equations. explain each step of your solution. if steps are not explained, you will not receive credit for that step. 2 + 9 = −26 −3 − 7 = 13

Your friend, taylor, missed class today and needs some identifying solutions to systems. explain to taylor how to find the solution(s) of any system using its graph.