Ineed on math asap a party rental company has chairs and tables for rent. the total cost to rent 3 chairs and 2 tables is $18. the total cost to rent 5 chairs and 6 tables is $48. what is the cost to rent each chair and each table

Let $x and $y be the cost of a chair and a table
3x+2y=18(1)
5x+6y=48(2)
(1)*3, 9x+6y=54(3)
(3)-(2), 4x=6
              x=1.5
sub.x=1.5 into (1), 3(1.5)+2y=18
                                            y=6.75
so the cost to rent a chair is $1.5 and a table is $6.75

The vertex of the quadratic function is (1.5, -.75)