SME
Grade 9 Math
Solving linear and compound inequalities
The main lesson, then each kind of problem it solves.
Solving linear and compound inequalities
Main lesson
Compound inequality with and
Use this for “Solve −5 < 3x + 4 ≤ 13” (the x term positive).
Compound inequality with or
Use this for “Solve 2x + 3 < −1 or 3x − 2 ≥ 7.”
Graph y (sign) mx + b
Use this for “Graph y ≥ 2x − 3 and test a point”, or with <, ≤ or >.
Whole-number answers
Use this for “$12 to join plus $4 a visit, and at most $50. How many visits?”