Worked-out Problems
Worked-out Problems
Worked-out Problems
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Chapter 3 continued<br />
Brain Game ––CONTINUED––<br />
5x 3x 56<br />
8x 56<br />
8<br />
<br />
x<br />
8<br />
56<br />
<br />
8<br />
x 7<br />
11x 9 42<br />
11x 9 9 42 9<br />
11x 33<br />
11<br />
1<br />
x<br />
1<br />
3<br />
<br />
3<br />
11<br />
x 3<br />
1 8 7 3<br />
B C D <br />
A<br />
Lesson 3.3<br />
3.3 Concept Activity (p. 130)<br />
1. 9 2x 1 3x<br />
<br />
3. 5x 2 3x 14<br />
<br />
<br />
<br />
<br />
So, the solution is 6.<br />
4. Yes. Sample answer: Removing x-tiles has no effect on<br />
the 1-tiles and vice versa.<br />
5. Sample answer: Solving an equation with variables on<br />
both sides of the equal sign adds one extra step, because<br />
you must first get all variable terms on one side.<br />
So, the solution is 8.<br />
2. 3x 4 8 x<br />
<br />
<br />
<br />
<br />
So, the solution is 2.<br />
<br />
<br />
<br />
3.3 Checkpoint (p. 131)<br />
1. 5n 2 3n 6<br />
5n 2 3n 3n 6 3n<br />
2n 2 6<br />
2n 2 2 6 2<br />
2n 8<br />
2 n<br />
8 2 2 <br />
n 4<br />
Check: 5n 2 3n 6<br />
5(4) 2 3(4) 6<br />
18 18 ✓<br />
2. 8y 4 11y 17<br />
8y 4 8y 11y 17 8y<br />
4 3y 17<br />
4 17 3y 17 17<br />
21 3y<br />
2 1<br />
3 y<br />
<br />
3 3<br />
7 y<br />
Check: 8y 4 11y 17<br />
8(7) 4 11(7) 17<br />
60 60 ✓<br />
Copyright © McDougal Littell/Houghton Mifflin Company<br />
All rights reserved.<br />
Chapter 3<br />
Pre-Algebra 81<br />
<strong>Worked</strong>-Out Solution Key
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