Learning goals: Teacher Facing Comprehend that for the graph of a vertical or horizontal line, one variable does not vary, while the other can take any value. Create multiple representations of linear relationship, including a graph, equation, and table. Generalize (in writing) that a set of points of the form $(x,b)$ satisfy the equation $y=b$ and that a set of points of the form $(a,y)$ satisfy the equation $x=a$. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 8.3 Linear Relationships, Grade 8.