7.6 Classic Puzzles

This document discusses solving word problems involving two unknown variables through systems of equations. It provides examples of different types of puzzles including age, travel rate with or against current/wind, coin values, chemical solutions, and number digits. It emphasizes defining the two variables, writing two related equations, and using methods like elimination to solve systems of equations to find the unknown values. Students are instructed to practice setting up the equations for several sample problems without solving them.