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Activity 7

The Dolphin

Geometry

plotting ordered pairs

connecting line graphs (xyLine)

Materials

dolphin picture overlayed on a grid (provided)

transparency of provided dolphin picture

grid paper

TI-73 ³

Students use ordered pairs to reproduce a picture of a dolphin on the TI-73 screen, and then set up an appropriate viewing window.

Setup

On the grid paper, demonstrate how to draw the x- and y-axes.

Have students draw and label the x- and y-axeson their papers. Ask: What do we call the intersection of the x- and y-axes? (the origin)

Have students label the origin on their graphs. (0,0)

Review how to graph points on the coordinate grid. Begin at the origin. Ask: How do I graph (2,5), (5,2), (-2,5),(5,-2),(2,-5),(-5,2),(-5,-2)?

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