When teaching slopes of parallel and perpendicular lines, I want students to have a visual image of the lines, not just memorize a formula. A simple exercise with parallel lines can get the message across.

Contributor Notes

Patricia Wallace-Gomez, patricia.w.gomez@hotmail.com, teaches geometry and second-year algebra at Dr. T. J. Owens Gilroy Early College Academy (GECA) in Gilroy, California. Her interests revolve around helping students understand the logical reasoning of mathematics and to appreciate its beauty. Taylor Hadnot

(Corresponding author is Wallace-Gomez patricia.w.gomez@hotmail.com)
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