Learning goals: Teacher Facing Coordinate tape diagrams, equations of the form $px+q=r$, and verbal descriptions of the situations. Explain (orally and in writing) how to use a tape diagram to determine the value of an unknown quantity in an equation of the form $px+q=r$. Interpret (in writing) the solution to an equation in the context of the situation it represents. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.6 Expressions, Equations, and Inequalities, Grade 7.