Which set of ordered pairs represents y as a function of x? A {(-9, 2), (0, 6), (1, -2), (-3, 6)}
B {(-1,0), (4,3), (-7, -3), (-1, -8)}
с
{(3, 2), (-4,-2), (3, 1), (-4,1)}
D {(5, 4), (2, 3), (1, 1), (2, 4)}