Activity Description Create graphs of functions and sets of ordered pairs on the same coordinate plane. This is like a graphing calculator with advanced viewing options.

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Graphit

Place in mathematics curriculum:

• illustrate the Cartesian coordinate system
• practice students' pattern recognitions skills
• practice students' graph reading skills
• illustrate the relationship between graphical and algebraic representations of functions

This activity allows the user to plot ordered pairs and algebraic functions on the same coordinate plane. It combines the capabilities of Simple Plot and Graph Sketcher. This activity would work well in groups of two to four for about forty-five minutes if you use the exploration questions and twenty minutes otherwise.

Preparations for this activity:

• answer the question "How do you fit a line to a set of data?"
• discuss the concepts of trend lines, slope, and the y-intercept