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Inequalities

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Inequalities

Solving and Graphing

–4.75

–5

–4.5

Graphing Inequalities

1. Describe the solutions of 7 < x + 4.

all real numbers greater than 3

2. Graph h ≥ –4.75

Write the inequality shown by each graph.

x ≥ 3

3.

x < –5.5

4.

INEQUALITIES – SOLVING/GRAPHING

Four students graphed the inequality 4 > b. Which describes the best solution?

A) An open line/circle at 4 shaded to the right

B) A closed line/circle at 4 shaded to the left

C) An open line/circle at 4 shaded to the left

D) A closed line/circle at 4 shaded to the right

INEQUALITIES – SOLVING/GRAPHING

Solve and graph the inequality:

INEQUALITIES – SOLVING/GRAPHING

Write an inequality to represent each relationship, then solve and graph:

a. Four more than twice a number is at least sixteen.

b. Three-fourths of a number is less than twelve.

INEQUALITIES – SOLVING/GRAPHING

If a – b > a + b, which statement is true?

A)The value of a is positive

B) The value of a is negative

C) The value of b is positive

D) The value of b is negative

INEQUALITIES – SOLVING/GRAPHING

Which is a solution of the inequality

7(2 – x)>4(x – 2)?

A) -2B) 2C) 4`D) 7

Linear Inequalities –solve and graph

Tell whether the ordered pair is a solution of the inequality:

(0, 3); y ≤ -x +3

(-2, 1); y < 2x + 4

Linear Inequalities –solve and graph

Stephen wants to buy yellow tangs and clown fish for his aquarium. He can spend no more than $77 on fish. Yellow tangs cost $15 each and clown fish cost $11 each. Write an inequality to represent the number of tangs (x) and clown fish (y) that he could purchase.

Solve the inequality for y (slope-intercept form).

Step 1

Graph the boundary line (the related equation). Use a solid line for ≤ or ≥. Use a dashed line for < or >.

Step 2

Shade the half-plane above the line for y > or ≥. Shade the half-plane below the line for y < or y ≤. Check your answer.

Step 3

Graphing Linear Inequalities

Graphing Inequalities

y 2x –3

Step 1 The inequality is already solved for y.

Step 2 Graph the boundary line y = 2x – 3. Use a solid line for .

Step 3 The inequality is , so shade below the line.

Linear Inequalities –solve and graph

Graph each inequality on a separate coordinate plane (remember to shade!)

y > 2x + 6

Linear Inequalities –solve and graph

Graph each inequality on a separate coordinate plane (remember to shade!)

x ≤ 2

Linear Inequalities –solve and graph

Graph each inequality on a separate coordinate plane (remember to shade!)

3x + 2y ≥ 6

Compound Inequalities

Solve each compound inequality and graph the solutions.

2 ≤ 2w + 4 ≤ 12

–1 ≤ w ≤ 4

3 + r > −2 OR 3 + r < −7

r > –5 OR r < –10

Compound Inequalities

Write the compound inequality shown by each graph.

x < −7 OR x ≥ 0

−2 ≤ a < 4

Compound Inequalities

The target heart rate during exercise for a 15 year-old is between 154 and 174 beats per minute inclusive. Write a compound inequality to show the heart rates that are within the target range. Graph the solutions.

154 ≤ h ≤ 174

Graphing Inequality Systems

To show all the solutions of a system of linear inequalities, graph the solutions of each inequality. The solutions of the system are represented by the overlapping shaded regions.

y ≤ 3

y > –x + 5

Graphing Inequality Systems

Graph the system of linear inequalities. Give two ordered pairs that are solutions and two that are not solutions.

–3x + 2y ≥2

y < 4x + 3

Graphing Inequality Systems

Graph the system of linear inequalities. Give two ordered pairs that are solutions and two that are not solutions.

Graphing Inequality Systems

Graph the system of linear inequalities. Give two ordered pairs that are solutions and two that are not solutions.

y ≤ x + 1

y > 2

Graphing Inequality Systems

y > x – 7

3x + 6y ≤ 12