I’m not sure if it’s multiplying, subtracting, or adding the 9 soooo here’s all of them :)
Multiplying:
y=5x*9
If x=1 y=45
If x=2 y=90
If x=3 y=135
Subtracting:
y=5x-9
If x=1 y=-4
If x=2 y=1
If x=3 y=6
Addition:
y=5x+9
If x=1 y=14
If x=2 y=19
If x=3 y=24
Hope this helps!!