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Administer a coordinate grid to each student in order to complete the following exercises:
- Maria plotted two points on the coordinate grid. She wrote these ordered pairs for the points: point A (3,-3) and point B (-3,0).
Explain the error she made.
How would you correct her error?
Answer: Maria made an error when she labeled point B.
The ordered pair for point B should be (0,-3). The numbers in Mary’s ordered pair were reversed.
An ordered pair is in the form (x,y). So when plotting points, you first follow the x-axis and then follow the y-axis.
- Line AB passes through points (2,2) and (-2, -2). Line CD passes through points
(-2,2) and (2, -2).
On the coordinate grid, draw lines AB and CD.
Name the coordinates of a point where the two lines intersect.
What word could you use to describe the relationship between lines AB and CD?
Answer: (0,0); perpendicular
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