AnswersOC27 MATH COLL ALGEBRA-1200710-S1-Degele-VOL7006PSolving Absolute Value Equations

Solving Absolute Value Equations Answers

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1
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Which number line represents the solutions to |x – 5| = 1?

A
A number line from negative 7 to 7 in increments of 1. Two points, one at negative 6 and one at negative 4.
Option A
B
A number line from negative 7 to 7 in increments of 1. Two points, one at 4 and one at 6.
Option B
C
A number line from negative 7 to 7 in increments of 1. Two points, one at negative 5 and one at 1.
Option C
D
A number line from negative 7 to 7 in increments of 1. Two points, one at negative 1 and one at 5.
Option D
2
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Which statement is true?

A
The equation –3|2x + 1.2| = –1 has no solution.
B
The equation 3.5|6x – 2| = 3.5 has one solution.
C
The equation 5|–3.1x + 6.9| = –3.5 has two solutions.
D
The equation –0.3|3 + 8x| = 0.9 has no solution.
3

Which equation has no solution?

A
|–x – 3| = 5
B
|2x – 1| = 0
C
|5 – 3x| = –8
D
|–x + 9| = 0
4

Which number line represents the solutions to |–2x| = 4?

A
A number line from negative 10 to 10 in increments of 2. Two points, one at negative 4 and one at 2.
Option A
B
A number line from negative 10 to 10 in increments of 2. Two points, one at negative 2 and one at 4.
Option B
C
A number line from negative 10 to 10 in increments of 2. Two points, one at negative 2 and one at 2.
Option C
D
A number line from negative 10 to 10 in increments of 2. Two points, one at negative 8 and one at 8.
Option D
5

Morgan is walking her dog on an 8-meter-long leash. She is currently 500 meters from her house, so the maximum and minimum distances that the dog may be from the house can be found using the equation |x – 500| = 8. What are the minimum and maximum distances that Morgan’s dog may be from the house?

A
496 meters and 500 meters
B
500 meters and 508 meters
C
492 meters and 508 meters
D
496 meters and 504 meters
6

To win a contest, the number of beans in a jar has to be guessed within 20 of the actual number. If the number of beans in the jar is 645, which equation can be used to find the minimum and maximum number of beans that will win the contest, and what is the maximum guess that could win?

A
|x – 645| = 20; maximum guess: 635 beans
B
|x – 645| = 20; maximum guess: 665 beans
C
|x – 20| = 645; maximum guess: 635 beans
D
|x – 20| = 645; maximum guess: 665 beans
7

Misha found that the equation –|2x – 10| – 1 = 2 had two possible solutions: x = 3.5 and x = –6.5. Which explains whether or not her solutions are correct?

A
She is correct, because both solutions satisfy the equation.
B
She is not correct, because she made a sign error.
C
She is not correct, because there are no solutions.
D
She is not correct, because there is only one solution: x = 3.5.
8

A while back, either James borrowed $12 from his friend Rita or she borrowed $12 from him, but he can’t quite remember which. Either way, he is planning to pay her back or ask that she pay him back this afternoon. If he has $42.80 in his wallet, which equation represents the amount of money he may have after he sees Rita?

A
|x – 42.80| = 12
B
|x + 42.80| = 12
C
|x – 12| = 42.80
D
|x + 12| = 42.80
9

Manuela solved the equation 3−2|0.5x+1.5|=2 for one solution. Her work is shown below.3−2|0.5x+1.5|=2 −2|0.5x+1.5|=−1 |0.5x+1.5|=0.5 0.5x+1.5=0.5 0.5x=−1 x=−2

A
x=−6
B
x=−4
C
x=2
D
x=4
10

Which equation has only one solution?

A
|x – 5| = –1
B
|–6 – 2x| = 8
C
|5x + 10| = 10
D
|–6x + 3| = 0
11

A while back, either James borrowed $12 from his friend Rita or she borrowed $12 from him, but he can’t quite remember which. Either way, he is planning to pay her back or ask that she pay him back this afternoon. If he has $42.80 in his wallet, which equation represents the amount of money he may have after he sees Rita?

A
|x – 42.80| = 12
B
|x + 42.80| = 12
C
|x – 12| = 42.80
D
|x + 12| = 42.80
12

Morgan is walking her dog on an 8-meter-long leash. She is currently 500 meters from her house, so the maximum and minimum distances that the dog may be from the house can be found using the equation |x – 500| = 8. What are the minimum and maximum distances that Morgan’s dog may be from the house?

A
496 meters and 500 meters
B
500 meters and 508 meters
C
492 meters and 508 meters
D
496 meters and 504 meters
13

Which number line represents the solutions to |x – 5| = 1?

A
A number line from negative 7 to 7 in increments of 1. Two points, one at negative 6 and one at negative 4.
Option A
B
A number line from negative 7 to 7 in increments of 1. Two points, one at 4 and one at 6.
Option B
C
A number line from negative 7 to 7 in increments of 1. Two points, one at negative 5 and one at 1.
Option C
D
A number line from negative 7 to 7 in increments of 1. Two points, one at negative 1 and one at 5.
Option D
14

What is the solution to –2|2.2x – 3.3| = –6.6?

A
x = –3
B
x = 3
C
x = –3 or x = 0
D
x = 0 or x = 3
15

Which number line represents the solutions to |–2x| = 4?

A
A number line from negative 10 to 10 in increments of 2. Two points, one at negative 4 and one at 2.
Option A
B
A number line from negative 10 to 10 in increments of 2. Two points, one at negative 2 and one at 4.
Option B
C
A number line from negative 10 to 10 in increments of 2. Two points, one at negative 2 and one at 2.
Option C
D
A number line from negative 10 to 10 in increments of 2. Two points, one at negative 8 and one at 8.
Option D
16

Which number line represents the solutions to |x + 4| = 2?

A
A number line from negative 7 to 7 in increments of 1. Two points, one at negative 6 and one at negative 2.
Option A
B
A number line from negative 7 to 7 in increments of 1. Two points, one at 2 and one at 4.
Option B
C
A number line from negative 7 to 7 in increments of 1. Two points, one at 2 and one at 6.
Option C
D
A number line from negative 7 to 7 in increments of 1. Two points, one at negative 4 and one at negative 2.
Option D
17

Which equation has no solution?

A
|4x – 2| = –6
B
|–2 – x| = 9
C
|3x + 6| = 6
D
|–2x + 8| = 0
18

Manuela solved the equation 3−2|0.5x+1.5|=2 for one solution. Her work is shown below.3−2|0.5x+1.5|=2 −2|0.5x+1.5|=−1 |0.5x+1.5|=0.5 0.5x+1.5=0.5 0.5x=−1 x=−2

A
x=−6
B
x=−4
C
x=2
D
x=4
19

Which statement is true?

A
The equation –3|2x + 1.2| = –1 has no solution.
B
The equation 3.5|6x – 2| = 3.5 has one solution.
C
The equation 5|–3.1x + 6.9| = –3.5 has two solutions.
D
The equation –0.3|3 + 8x| = 0.9 has no solution.
20

Which equation has only one solution?

A
|x – 5| = –1
B
|–6 – 2x| = 8
C
|5x + 10| = 10
D
|–6x + 3| = 0

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