Which of the following tables represents a linear function?
x −2 −1 0 2 4
y −4 negative two thirds −1 two thirds 1
x −3 −1 0 1 5
y −7 negative nine halves negative thirteen fourths −2 3
x −2 −1 0 2 4
y −4 −2 −1 0 1
x −4 −1 0 1 2
y −4 2 −4 0 2