Learning goals: Teacher Facing Analyze and describe (orally and in writing) the effects of adding a constant term to an expression defining an absolute value function. Define absolute value function in terms of the distance of the input from 0. Interpret an absolute value function described in words or in function notation, and create a table of values and a graph to represent the function. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from Alg1.4 Functions, Algebra 1.