Using the TI-85 graphing calculator, graph the triangle whose vertices are:

Use parametric equations to draw the sides of the triangle.

[Press here to see animation again!]

- If you are not familiar with the graphing of functions on the TI-85, then first read the Initial Setup page from Little's Basic Guide to the TI-85.
- In order to graph a system of parametric equations, the calculator must be
in the
**PARAM**graphing mode. To change into this mode, press 2nd MODE. You should see a screen similar to the following: - Using the arrow keys, move the blinking cursor to the
**PARAM**item of the fifth row and press the ENTER key. - Press the EXIT key.
- Press the GRAPH key and then pick
**E(t)=**by pressing the F1 key. - If necessary, keep pressing F4 key until only
the two items
**xt1=**and**yt1=**appear on the screen. - At the prompt
**xt1=**, type in**1 + 2t**and press the ENTER key.

- At the prompt
**yt1=**, type in**3 - 3t**and press the ENTER key.

- At the prompt
**xt1=**, type in**3 - 5t**and press the ENTER key.

- At the prompt
**yt1=**, type in**- 3t**and press the ENTER key.

- At the prompt
**xt1=**, type in**-2 + 3t**and press the ENTER key.

- At the prompt
**yt1=**, type in**-3 + 6t**and press the ENTER key.

- The range settings for the graph above are
- Pick the item
**GRAPH**from the menu by pressing the F5 key.