Chapter 3 Linear Systems and Matrices - 3.3 Graph Systems of Linear Inequalities - 3.3 Exercises - Skill Practice - Page 171: 22

See the graph

We graph the equations exactly like we did for the system of two inequalities. First graph $y \geq x$ (blue) $x + 3y\geq 5$ (pink) and $3x+y\geq -3$ (black) Using the shading on the attached graph, we know that the intersection of all three inequalities is the solution.