# Graphing utility

• Jan 21st 2008, 11:57 PM
Amy
Graphing utility
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 .

• Jan 22nd 2008, 12:27 AM
Amy
I drew the graph in graphmatica. Given below.
But how to find the t value when y=5545.25 from the graph?
seems very difficult.
• Jan 22nd 2008, 01:14 AM
janvdl
Quote:

Originally Posted by Amy
I drew the graph in graphmatica. Given below.
But how to find the t value when y=5545.25 from the graph?
seems very difficult.