Variations - Direct, Inverse, Joint: Paper Chain is a good way for students to practice variations. Students solve the problem on one link and then find the solution to it. The solution link has the next problem. Note: this set of problems includes only algebraic variations, no graphic representations. Variations (direct, inverse and joint) are part of common core standard: HSA.SSE.A.1b., HSA.CED.A.2., HSA.REI.D.10.
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