SME
Grade 9 Math
Piecewise, step and absolute value functions
The main lesson, then each kind of problem it solves.
Piecewise, step and absolute value functions
Main lesson
A phone plan with extra data
Use this for “$30 a month covers 5 GB; each GB past that costs $8. What does 8 GB cost?”
A step function: pay by the started hour
Use this for “Parking is $4 for each hour or part of an hour. What do 2.5 hours cost?”
Absolute value function
Use this for “Graph y = −2|x − 1| + 6: its vertex, which way it opens, and its zeros.”
Graph of |f(x)|
Use this for “Graph y = |x² − 2x − 3|” from the graph of f.