The system has the solution (2,9), where p, q,r, t, u, and v = 0. select all systems of equations that have the same situation

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list

How to do this , and can some one explain