Learning goals: Teacher Facing Create an equation of a line with positive slope on a coordinate grid using knowledge of similar triangles. Generalize (orally) a process for dilating a slope triangle $ABC$ on a coordinate plane with center of dilation $A$ and scale factor $s$. Justify (orally) that a point$ (x,y)$ is on a line by verifying that the values of $x$ and $y$ satisfy the equation of the line. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 8.2 Dilations, Similarity, and Introducing Slope, Grade 8.