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9-12 Extra Support Materials for Algebra 1 Unit 4 Lesson 4

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K-5 Math 6-8 Math •9-12 Math

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Algebra 1 Geometry Algebra 2 •Extra Support Materials for Algebra 1

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Lesson 1 Lesson 2 Lesson 3 •Lesson 4 Lesson 5 Lesson 6 Lesson 7 Lesson 8 Lesson 9

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Extra Support Materials for Algebra 1

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Lesson 4

4.1 Warm-up 4.2 Activity 4.3 Activity

Unit 4, Lesson 4

From One- to Two-Variable Inequalities

Extra Support Materials for Algebra 1

4.1

Warm-up

For each graph, what do all the ordered pairs in the shaded region have in common?

<p>Coordinate plane, x, negative 10 to 10 by 2, y, negative 10 by 10 by 2. Horizontal line drawn at y = 0. Plane shaded above the line y = 0.</p> — A

<p>Coordinate plane. Quadrants 2 and 3 shaded</p> — B

<p>Coordinate plane, quadrant 1 shaded </p> — C

<p>Coordinate plane, quadrant 4 shaded </p> — D

4.2

Activity

Write at least 3 values for that make the inequality true.
Graph the solution to each inequality on a number line.
Using the inequality , write 3 coordinate pairs for which the -coordinate makes the inequality true. Use the coordinate plane to plot your 3 points.

4.3

Activity

Graph the line that represents the equation .
Is the point on the line?
1. Explain how you know using the graph.
2. Explain how you know using the equation.
Use the 3 points and .
1. Write values for and so that the points are on the line.
2. Write values for and so that the points are above the line.
3. Write values for and so that the points are below the line.

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