Name points using coordinate pairs, and use the coordinate pairs to plot points. This discussion leads to the discovery that a second number line, perpendicular to the first, creates an efficient, precise way to describe the location of these points.
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From EngageNY.org of the New York State Education Department. Grade 5 Mathematics Module 6, Topic A, Lesson 3.
Available from engageny.org/resource/grade-5-mathematics-module-6-topic-lesson-3; accessed 2015-05-29.
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