Which function rule represents the data in the table below?

X | 1 | 2 | 3 | 4 | 5
Y | 9 | 12| 15 | 18 | 21

A: y=4+5x
B: y=3+6x
C: y=5+4x
D: y=6+3x

1 answer

C: y=5+4x