12.4.8: Chapter 8
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- May 28, 2023
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Try It
no
no
x = −16
x = −20
n = −1
x = −4
b = 6.4
c = 14
y = 15
z = 2
p = 5
q = −16
h = −1
x = 1
x + 11 = 41; x = 30
y − 12 = 51; y = 63
4x − 3x = 14; x = 14
7a − 6a = −8; a = −8
a + 6 = 13; Athena weighs 7 pounds.
26 + h = 68; Henry has 42 books.
19,875 = s − 1025; the sticker price is $20,900.
7.75 = n − 3.25; the price at night is $11.00.
y = −16
z = −13
b = 144
c = 128
k = −8
g = −3
n = 35
y = 18
x = 2
n = −5
c = −3
n = −6
n = −5
x = −4
a = −8
y = 5
m = 9
n = 10
c = 1
p = −7
m = −3
j = 2
h = 1
x = −1
y = 4
q = 1
n = 1
a = −5
k = −6
x = 10
y = −3
x = −5
y = −5
x = 4
y = 1
y = −6
z = 8
a = 2
n = 2
p = −2
q = −8
u = 2
x = 4
n = 1
m = −1
y = 3
v = 40
u = −12
a = −2
c = −2
p = −4
q = 2
n = 2
m = −1
x = 20
x = 10
h = 12
k = −1
n = 9
d = 16
Section 8.1 Exercises
yes
no
x = 5
p = −11.7
a = 10
y = 13.8
x = −27
m = 17
x = 8
n = −20
y = 2
w = −1.7
x = −2
m = −4
k = 6
c = −41
y = 28
x + (−5) = 33; x = 38
y − 3 = −19; y = −16
p + 8 = 52; p = 44
5c − 4c = 60; c = 60
−9m + 10m = −25; m = −25
Let p equal the number of pages read in the Psychology book. 41 + p = 54. Jeff read 13 pages in his Psychology book.
Let d equal the daughter’s age. d = 12 − 5. Eva’s daughter’s age is 7 years old.
21 pounds
100.5 degrees
$121.19
Answers will vary.
Section 8.3 Exercises
x = 6
y = 6
m = −8
b = −8
x = −4
q = −2
k = −11
x = 9
b = −3
z = 3
r = −2
x = 19
f = 7
q = −5
c = −4
x = 2
y = 4
m = −6
a = 7
a = −40
p = 15
z = 3.46
w = 60
x = 23
y = 9
x = 6
y = 3
n = −2
p = −1
x = 5
v = 1
m = 0.25
t = −9
b = 2
m = 6
r = 3
y = −4
n = 2
x = 34
s = 10
30 feet
8 nickels
Answers will vary.
Answers will vary.
Answers will vary.
Review Exercises
yes
no
12
u = 17
n = 44
y = 4
n = −8
−6 + m = 25; m = 31
s = 11 − 3; 8 years old
c − 46.25 = 9.75; $56.00
x = 9
p = 21
n = 108
x = 48
m = 4
x = 15
r = 3
p = 5
x = −22
y = −13
k = −5
x = 6
u = −7
x = −2
s = −22
y = 12
r = 38
y = 26
n = 2
x = 5
p = −20
