Respuesta :

texaschic101
just switch the x's and y's....
inverse of (0,0) is still (0,0)
inverse of (9,-1) is (-1,9)
inverse of (7,4) is (4,7)
inverse of (-10,3) is (3,-10)

inverse is : (0,0), (-1,9) , (4,7) , (3,-10)