We need to find the best function that represents the equation:
Then,
When x=0, the y-value is 0
When x=1, the y-value is 30
when x=2, the y-value is 60
when x=3, the y-value is 90.
Hence, we can say that the function that best represents the graph is y=30x
because it has a rate of change of 30.
