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6-8 Accelerated 7 Unit 3 Lesson 12

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K-5 Math •6-8 Math 9-12 Math

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Accelerated 6 •Accelerated 7

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

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Lesson 1 Lesson 2 Lesson 3 Lesson 4 Lesson 5 Lesson 6 Lesson 7 Lesson 8 Lesson 9 Lesson 10 Lesson 11 •Lesson 12 Lesson 13 Lesson 14 Lesson 15 Lesson 16 Lesson 17 Lesson 18

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9-12

Accelerated 6
Accelerated 7

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Unit 2
Unit 3
Unit 4
Unit 5
Unit 6
Unit 7
Unit 8
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Lesson 3
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Lesson 6
Lesson 7
Lesson 8
Lesson 9
Lesson 10
Lesson 11
Lesson 12
Lesson 13
Lesson 14
Lesson 15
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Lesson 17
Lesson 18

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IM K-5 Math
IM 6-8 Math
IM 9-12 Math

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Unit 3, Lesson 12

Writing and Graphing Inequalities

Accelerated 7

Practice

Problem 1

At the book sale, all books cost less than \$5.

What is the most expensive a book could be?
Write an inequality to represent the costs of a book at the sale.
Draw a number line to represent the inequality.

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Problem 2

Lesson 12 Resources

Student Materials

Kiran started his homework before 7:00 p.m. and finished his homework after 8:00 p.m. Let \(h\) represent the number of hours Kiran worked on his homework.

Decide if each statement is definitely true, definitely not true, or possibly true. Explain your reasoning.

\(h > 1\)
\(h > 2\)
\(h < 1\)
\(h < 2\)

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Problem 3

ForLesson 11: Solving Problems about Percent Increase or Decrease

Select all the expressions that are the result of decreasing \(x\) by 80%.

\(\frac{20}{100}x\)
\(x - \frac{80}{100}x\)
\(\frac{100-20}{100}x\)
\(0.80x\)
\((1-0.8)x\)

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Problem 4

ForLesson 6: Reasoning about Solving Equations (Part 1)

Solve each equation.

\(\frac17a+\frac34=\frac98\)

\(\frac23+\frac15b=\frac56\)

\(\frac32=\frac43c+\frac23\)

\(0.3d+7.9=9.1\)

\(11.03=8.78+0.02e\)

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Problem 5

ForLesson 11: Congruence

Here are 2 triangles.

Two triangles in an x y plane.

Show that the 2 triangles are congruent.
Find the side lengths of triangle \(DEF\) and the angle measures of triangle \(ABC\).

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