Students see that geometric transformations—dilation and translation—correspond to algebraic parameters—m and b—in the familiar equation for a linear function.

Contributor Notes

Scott Steketee,, is a senior scientist at the 21st Century Partnership for STEM Education and teaches math methods at the University of Pennsylvania Graduate School of Education. In addition to having taught math and computer science in Philadelphia public schools, he has been a Web Sketchpad software developer and a curriculum developer and has led professional development for teachers.

Daniel Scher,, is a specialist in mathematics education technology at McGraw-Hill Education. He was the principal investigator for the NSF-funded Dynamic Number project ( and has worked on a wide variety of mathematics curriculum projects, including the development of an after-school program based on the Russian Elkonin-Davydov curriculum. Steketee and Scher manage the Web Sketchpad-themed blog, Sine of the Times, at

(Corresponding author is Steketee author is Scher
The Mathematics Teacher


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