Students make strategic choices–and justify them–to solve a system of two linear equations.

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Contributor Notes

Samuel Otten,, is an assistant professor at the University of Missouri. He is interested in promoting secondary students' engagement in mathematical practices.

Andrew Otten,, is a mathematics teacher at Northview High School in Grand Rapids, Michigan. He is interested in learning and creating new ways to provoke students' deep understanding.

(Corresponding author is Otten
(Corresponding author is Otten
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