Final answer:
The equation that represents the rate of change is x - 45 = y + 15 or x = y + 60.
Step-by-step explanation:
The equation that represents the given rate of change is x - 45 = y + 15. This equation shows that when y increases by 15, x decreases by 45. The equation can be rearranged to x = y + 60, which represents the relationship between x and y.