the in
1) ((-1,8), (0, 15), (1,-4), (2, 0)) 2) ((-5, 2), (5,2), (0, -3), (3,-8)) 3) ((-2,7), (6,2).(-2,-3), (0, 9))
it is a function
because there is not any
Points which have the
X-Coordinato and differen
y-Coordinatas.
4) ((7,2), (4,-6), (2,-2), (4,-9)) 5) ((2,3), (2, 4), (2, 5), (2,6))
6) ((1,-4), (2,-4), (3,-4), (4-4))