Dynamic graphs and student reasoning

Marshall Lassak has written an article about Using dynamic graphs to reveal student reasoning. This article was published earlier this month in International Journal of Mathematical Education in Science and Technology. Here is the (rather short) abstract of the article:

Using dynamic graphs, future secondary mathematics teachers were able to represent and communicate their understanding of a brief mathematical investigation in a way that a symbolic proof of the problem could not. Four different student work samples are discussed.

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