Learning goals: Teacher Facing Determine whether a graph represents a function, and explain (orally) the reasoning. Identify the graph of an equation that represents a function, and explain (orally and in writing) the reasoning. Interpret (orally and in writing) points on a graph, including a graph of a function and a graph that does not represent a function. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 8.5 Functions and Volume, Grade 8.