A 2-Dimensional Number Line

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You've now worked with a horizontal number line and a vertical number line (the thermometer). When the two number lines come together, they create a coordinate plane. The horizontal number line has a specific name on a coordinate plane: x-axis The vertical number line has a specific name on a coordinate plane: y-axis (x,y) A coordinate pair tells you where to plot a point on a coordinate plane. The first coordinate tells you

how far to move on the x-axis and the second coordinate tells you how far to move on the y-axis.

Your Turn!

For the point (2,3), how far would you go on the x-axis?

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For the point (5, -8), how far would you go on the y-axis?

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