Answer
The equation is y=-50x+62250
The graph is shown in the screenshot
Work Step by Step
The equation is y=-50x+62250 because when x is 0, the amount of spray left is 62250 mg which is the y-interecept. the slope is 50 negative because the amount of spray left after every spray is decreased by 50 mg as after one spray the amount of spray is 62200 mg and the amount decreases by 50 every time subsequently.