Please help!

If f (x) = 1/9 x-2 what is f^-1(x)

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)

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?

Solve 3x-18=2y and 5x-6y=6 by elimination show work