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Published byLeon Harvey Modified over 8 years ago

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Graphing linear Inequalities in 2 Variables

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Checking Solutions An ordered pair (x,y) is a solution if it makes the inequality true. Are the following solutions to: 3x + 2y ≥ 2 (0,0)(2,-1)(0,2) 3(0) + 2(0) ≥ 2 0 ≥ 2 Not a solution 3(2) + 2(-1) ≥ 2 4 ≥ 2 Is a solution 3(0) + 2(2) ≥ 2 4 ≥ 2 Is a solution

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To sketch the graph of a linear inequality: 1.Sketch the line given by the corresponding equation ( solid if ≥ or ≤, dashed if ). This line separates the coordinate plane into 2 half- planes. In one half-plane – all of the points are solutions of the inequality. In the other half-plane - no point is a solution 2.You can decide whether the points in an entire half- plane satisfy the inequality by testing ONE point in the half-plane. 3.Shade the half-plane that has the solutions to the inequality.

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The graph of an inequality is the graph of all the solutions of the inequality 3x+ 2y ≥ 2 y ≥ -3/2x + 1 (put into slope intercept to graph easier) Graph the line that is the boundary of 2 half planes Before you connect the dots check to see if the line should be solid or dashed solid if ≥ or ≤ dashed if

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y ≥ -3/2x + 1 Step 1: graph the boundary (the line is solid ≥) Step 2: test a point NOT On the line (0,0) is always The easiest if it’s Not on the line!! 3(0) + 2(0) ≥ 2 0 ≥ 2 Not a solution So shade the other side of the line!!

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Graph: y < 6

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4x – 2y < 7

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