98 points and brainliest answer for explaining your ! i dont ! even if you at least answer number 3 that would mean a hole !

2.

(a) No two ordered pairs have the same x-coordinate. That makes it a function.

(b) If the same x-coordinate appeared twice. For example, if the last point were replaced with point (4, 21), then it would not be a function since now there are two points with the same x-coordinate, 4.

(c) For each point, multiply x by 2. Then subtract 1. You will get the correct y-coordinate. The function is:

f(x) = 2x - 1

20%

step-by-step explanation: