For extra credit (using the graphing calculator):
Write a function equation for each plan.
Press the [y=] key
In y1= Type in .02x + .75
In y2= Type .05x
Press WINDOW. Change it so it looks like this:
Press GRAPH. You should see this:
Note: a blinking cursor appears on your graph. Using the cursor keys, position the cursor just to the left of where you think the intersection is.Press ENTER
Note: use your right cursor key to drag the cursor to just beyond where you think the intersection is.
Note: use your down cursor key to drag the cursor just below where you think the intersection is.
Press 2nd CALC
Note: you’re asked First Curve? It is so;Press ENTER
Note: Second Curve? It is so;Press ENTER
Note: At this point you are asked to guess, you can but you don’t have toPress ENTER
You should see this:
When is Plan A better than Plan B?
When does Plan A equal Plan B?
When is Plan B better than Plan A?