standard_description: Prove that, given a system of two equations in two variables, replacing one equation by the sum of that equation and a multiple of the other produces a system with the same solutions.
problem_activity: Stage 3: Add 2 Hands
Required Preparation
Materials to Copy
Blackline Masters
Math Fingers Stage 3 Recording Sheet

Narrative
Each partner holds up some fingers on one hand. Partners work together to figure out how many fingers are up altogether.


aligns: no