Slopes of Lines

What is the slope of line AB?

Calculate the slope of line CD.

In your words type what parallel mean?

By using the points C and D move line CD so that it will be parallel to line AB. "Parallel" will appear on the screen when the two lines are parallel. What do you notice?

What can be said about parallel lines?

Move both lines to a new location so the word "Parallel" appears and then calculate and type their slopes to verify what you you have stated fom the previous question. Then comment on if you were correct.

Write a mathematical rule about the slope of parallel lines.

In your words state what perpendicular means.

Move point A around the graph until line AB is perpendicular to line CD. "Perpendicular" will appear when the two lines are perpendicular. Calculate the slope of line AB and Line CD. What do you notice?

Based on what you noticed, think and type below two slopes that you believe would be perpendicular. Then move each line to represent each of the slopes you typed. Were you correct with your slopes?

Write a statement about the slopes of perpendicular lines.

Write mathematical rule about the slopes of perpendicular lines.