Which set of ordered pairs (x, y) could represent a linear function?
A = {(−2,9), (2,7), (4,6), (6,5)}
B = {(-3,-7), (0,-4), (3,-1), (6,1)}
C = {(2,6), (3, 3), (4,0), (5,-2)}
D = {(1, -3), (3,-2), (6,-1), (8,0)}