Which of the following relations DOES NOT represent y as a function of x. (hint: you may choose more than one answer) {(-6,3), (2,0), (3,-4), (1,8)}
{(-6,3), (2,0), (3,-4), (1,8)}

{(2,2), (1,5), (5,4), (2,4)}
{(2,2), (1,5), (5,4), (2,4)}

{(-6,2), (0,1), (-4,8), (3,8)}
{(-6,2), (0,1), (-4,8), (3,8)}

{(4,8), (4,2), (2,6), (1,6)}
{(4,8), (4,2), (2,6), (1,6)}