Learning goals: Teacher Facing Describe (orally and in writing) a graph of a function as “increasing” or “decreasing” over an interval, and explain (orally) the reasoning. Interpret (orally and in writing) a graph of temperature as a function of time, using language such as “input” and “output”. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 8.5 Functions and Volume, Grade 8.