Algebra 5-5 Using an automatic grapher.

Rewrite the following equations so they would be in the correct

form for you to enter them into Y= on your graphing calculator.

1. x + y = 10 ___________________

2. 4x + y = 7 ___________________

3. x – y = 9 ___________________

4. 4x – 2y = 8 ___________________

5. 3x – ½ y = 5 ___________________

6. On your graphing calculator, go to Y= and enter these equations.

Y₁ = 3x + 200 Y₂ = 5x + 130

Now go to your window and decide what your

Xmin, Xmax, Ymin, and Ymax should be.

Think about where these graphs will start off when x = 0.

What you want to find is where these graphs cross.

Once you set your window, graph the function.

Using your TRACE key try to find a close approximation for

the intersection of these lines.

What was your approximation?

( ____, ____)

Now hit the CALC button above the TRACE key.

Select button 5 intersect.

Since there are only two lines just hit ENTER

when it says first curve and second curve.

Do the same when it says GUESS.

What was the intersection?

( ____, ____)