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Published byNathaniel Mitchell Modified over 8 years ago

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**Warm Up Graph each inequality. 1. x > –5 2. y ≤ 0**

3. Write –6x + 2y = –4 in slope-intercept form, and graph. y = 3x – 2

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Learning Target Students will be able to: Graph and solve linear inequalities in two variables.

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**Tell whether the ordered pair is a solution of the inequality.**

(–2, 4); y < 2x + 1 y < 2x + 1 4 2(–2) + 1 4 –4 + 1 4 –3 < (–2, 4) is not a solution.

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**(3, 1) is a solution. (3, 1); y > x – 4 y > x − 4 1 3 – 4**

– 4 1 – 1 > (3, 1) is a solution.

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** a. (4, 5); y < x + 1 b. (1, 1); y > x – 7 y < x + 1**

< – 7 > 1 –6 (4, 5) is not a solution. (1, 1) is a solution.

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A linear inequality describes a region of a coordinate plane called a half-plane. All points in the region are solutions of the linear inequality. The boundary line of the region is the graph of the related equation.

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**Graphing Linear Inequalities**

Step 1 Solve the inequality for y (slope-intercept form). Step 2 Graph the boundary line. Use a solid line for ≤ or ≥. Use a dashed line for < or >. Step 3 Shade the half-plane above the line for y > or ≥. Shade the half-plane below the line for y < or y ≤. Check your answer.

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** Graph the solutions of the linear inequality. y 2x – 3**

Check y 2x – 3 (0) – 3 0 –3

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**The point (0, 0) is a good test point to use if it does not lie on the boundary line.**

Helpful Hint

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** Graph the solutions of the linear inequality. 5x + 2y > –8 Check**

(0) – 4 0 –4 >

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**Graph the solutions of the linear inequality.**

2x – y – 4 > 0 Check

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** Graph the solutions of the linear inequality. Check y ≥ x + 1**

(0) + 1 0 ≥ 1

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**Ada has at most 285 beads to make jewelry**

Ada has at most 285 beads to make jewelry. A necklace requires 40 beads, and a bracelet requires 15 beads. Write a linear inequality to describe the situation. Let x represent the number of necklaces and y the number of bracelets.

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**Solve for y and graph. # of bracelets Remember, Ada can only use**

whole numbers for x and y. In Algebra 2 we will determine which of those points maximizes profit! # of necklaces

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**Write an inequality to represent the graph.**

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**Write an inequality to represent the graph.**

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