Learning goals: Teacher Facing Comprehend that "reflecting" a function's graph across an axis means replacing either the inputs or the outputs with their opposite values. Create a graph of $y=\text-f(x)$ or $y=f(\text-x)$ given the graph of $y=f(x)$. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from Alg2.5 Transformations of Functions, Algebra 2.