Activity Description Students can create graphs of functions by entering formulas -- similar to a graphing calculator.

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Graph Sketcher

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 see functions typed in as algebraic expressions graphed on the coordinate plane. 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