Which is a linear function?
•{(-2,6), (-1,3), (0,0), (1, -3), (2,-6)}
•{(-6,6)(-3, 3), (0,0), (3, 3), (6,6)}
• {(-2,6), (-1,3), (0, 2), (1, 3), (2,6)}
• {(6,-2), (6,-1), (6,0), (6,1), (6,2)}