Graph the inequality y ≤ 2x + 3 on a coordinate plane. State whether the point (2, 1) satisfies the inequality or not.
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Math question: Solve the inequality system: -2x + 3y ≥ 6 and 2x + y < 9. Graph the solution on a coordinate plane. How many points lie within the solution?
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What is the domain of the reciprocal function f(x) = 1/x ?