i need help ​

When \(x=0\), \(y = 0 \).

 

When \(x = 4\), \(y = 12 \)

 

The formula for the rate of change is \(\text{rise} \over \text{run}\), where rise is the change in y-coordinate, and run is the change in x-coordinate.

 

Can you take it from here?