I really need help with this due soon!! will mark brainliest

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

Val and tony get paid per project. val is paid a project fee of $44 plus $12 per hour. tony is paid a project fee of $35 plus $15 per hour. write an expression to represent how much a company will pay to hire both to work the same number of hours on a project.

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