Learning goals: Teacher Facing Comprehend that any linear function can be represented by an equation in the form $y=mx+b$, where $m$ and $b$ are rate of change and initial value of the function, respectively. Coordinate (orally and in writing) the graph of a linear function and its rate of change and initial value. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 8.5 Functions and Volume, Grade 8.