You will be using a program called Algebra Xpresser. This program will allow us to graph the linear equations we have been exploring in the classroom using the graphing calculators. The graphs here will be a bit more easy to see and much more colorful.

Go to the

You should see a white screen with a tool bar to the right. You will see that is selected, or in other words highlighted. This is where we will type in the equations we want to graph. Make sure your CAPS LOCK is off.

Now, you will type in

You should see a graph of the linear equation

If you want to get a closer look at some portion of your graph, you will have to zoom. You do this by creating a box around the area you want to see up close. To create the box, click on the upper right or left hand side of the area you want to see up close and do not let go of the mouse. Drag the mouse until you have a box around that area. When you let go, you will see your graph zoomed in. You should be able to see some definite ordered pairs.

If you want to resize the window to get back to your "standard" window (-10 to +10 on both axes), you will need to select the third tool down on your tool bar. It looks like a smaller graph with arrows on both sides. When you select this, you will get a smaller version of your graph. By clicking on the house button, you will get back to your original standard window. Your window should now be resized.

If you want to trace your graph to identify ordered pairs, you must click on the "+" sign in the upper right hand corner of your screen. You will see a box open up with x and y. As you move your mouse over the screen, it will tell you the ordered pair at each location. It is very tricky to use the trace function here because you will have to be "precisely" on your line in order to identify those solutions of your equation. It is much easier to read the points that are on your line by finding its ordered pair looking at the x and y axis.

Use the tool bar to select the tool. Clear out any equations that are already there. You are going to be entering more than one equation at a time. To do this you will go to a new line and enter the word "or" before the next equation.

ENTER

GRAPH What is the color of the line? _______

What is the ordered pair of the point that touches the x-axis? _______

What is the ordered pair of the point that touches the y-axis? _______

Now below that equation,

ENTER

GRAPH What is the color of that line? _______

What is the ordered pair of the point that touches the x-axis?_______

What is the ordered pair of the point that touches the y-axis? _______

How are the graphs alike? Compare below:

Can you predict what y = x - 3 will look like? Can you predict what the ordered pair of the point that touches the x-axis will be? Can you predict what the ordered pair of the point that touches the y-axis? Answer below.

Graph

Clear out your equations from the screen.

ENTER

GRAPH What is the color of the line? _______

What is the ordered pair of the point on the y-axis? _______

ENTER

What is the color of the line? _______

What is the ordered pair of the point on the y-axis? _______

Predict what

Clear out your screen.

ENTER

GRAPH What is the color of the line? _______

What is the ordered pair of the point on the x-axis? _______

ENTER

GRAPH What is the color of the line? _______

What is the ordered pair of the point on the x-axis? _______

Predict what

Can you guess what the graph of

Clear out your screen. Graph the following equations one at a time. Keep the previous equations up there noting the colors of the lines and comparing the beginning graph with each new addition.

GRAPH

GRAPH

GRAPH

GRAPH

GRAPH

What affect did the increasing number have on your original line?

What affect did the

Clear out your

GRAPH

GRAPH

GRAPH

GRAPH

What is the ordered pair of the point that the line goes through on the y - axis for:

What affect does adding or subtracting a number have on your original graph? Can you predict what the graph of