I have this problem.

You buy a personal watercraft for $8100

The depreciated value y after t years is y = 8100-929(t), for 0

(a) Use the constraints of the model to graph the equation using an appropriate viewing window.

(b) Use the zoom and trace features of a graphing utility to determine the value of t when y = 5545.25. Verify your answer algebraically.

(c) Use the value feature or the zoom and trace features of a graphing utility to determine the value of y when t = 5.5. Verify your answer algebraically.

Which graphing utility should I use. I have mathGV and graphmatica. But don't know how to see the graph since the y values are very high .

Any one can help please?