1/2(3/2y+1/3)=-1/2(y-5/2)

Can someone me and do the problem plz so i can understand it more better

Kayla and alberto are selling fruit for a school fundraiser. customers can buy small boxes of grapefruit and large boxes of grapefruit. kayla sold 3 small boxes of grapefruit and 1 large box of grapefruit for a total of $65. alberto sold 1 small box of grapefruit and 1 large box of grapefruit for a total of $55. what is the cost each of one small box of grapefruit and one large box of grapefruit?

Graph the equationy=x^2 -[tex]y = x^{2} - 2[/tex]