Luttrell 2012
159
Answer Key, chapters 6-8
Sheet 6f:
1. A&B, B&C
2. D
3. 3x + 5y = 22
4. 3x + 4y = -1
Sheet 6g:
Graphs are not included. Simplified equations: 1. y < -2x -4
2. y > -3x + 5
3. y < x – 4
4. y ≤ 2x + 4
5. y ≥ - ½ x + 2.5
6. y > 4/3 x - 3
Sheet 6h:
1. (2.5, 0.5)
2. (2, 4)
3. (2,-1)
4. (-3, -4)
5. (-3, -2)
6. (3, 5)
Sheet 6i:
1. (3, 2)
2. (1, 1)
3. (2, -3)
4. (2,4)
5. (3, 1)
6. (3, -2)
Sheet 6j:
1. (½, ⅓)
2. (1, 3)
3. (4, 7)
4. (-6, 5)
5. (2, -5)
6. once
Sheet 6k:
1. Y = 0.49x; $36.75
2. Y = 64x + 5500; $21,500
3. Y = 25x + 65; $127.50
4. y = 8x; $96
5. Y = -1360x + 17000; $-3400 (cost you to get rid of it!!!)
Sheet 6L:
1. 161.6°F
2. $270
3. 36 ft
4. 46,875 ft
2
5. 2 ⅔ cups
6. 1⅓ cup
7. Keith = 48, Shirleen = 32, Rachel = 16
Chapter 6 Test: 1. -9, ½, -10
2. C = 60, A = 480
5. (4, 3)
6. 6x – 9y = 8; -x + 2y = 10
7. y = -6x + 27 9. Y = 0.75x + 2.75
10. 2x – 3y = 17; 3x + 2y = 6
Bonus: 32; -1
Sheet 7a:
1. 12
2. 36
5. 16
6. {}
8. 8y + 49y
2
9. 176x
2
11. 4x
4
12. ½
14. Z
3
y
6
x
9
15. 1
Sheet 7b:
1. Y
11
2. –x
8
y
6
3. Z
6
4. A
18
b
11
5. X
8
6. a/2
Sheet 7c:
1. 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
2. 3 and 5
3. 11
4. 3 and 9
5. 6, 9, and 11
Sheet 7d:
1. 2
2
×29
2. 5
2
×7
5. GCF = 7; LCM = 105
7. GCF = 3, LCM 378
9. GCF = 6; LCM = 168
11. GCF = 5; LCM = 350
13. GCF = 8; LCM = 448
Sheet 7e:
1. 2√6
2. 5√3
3. 4√6
5. 12
6. 15
7. 25
Sheet 7f:
1. 16
3. 32
4. 16
6. 49
10. √3
11. 9
Sheet 7g:
1. 0
2. 3√3
3. 9√3
4. 1
5. -6x
6. 10√2
7. 6√2
8. 8√2
9. 54
10. 24√6
11. √6
12. 75
Sheet 7h:
1. √3
2. 3√(5)/5
3. √(30)/6
4. √(6)/3
5. √(2)/2
Sheet 7i:
1. ±4
2. ±5
3. 2
4. 144
5. 225
6. 30
7. 50
8. 22
Chapter 7 Test: 1. 8; 48
2. 2; 504
3. 8∕27; -256
4. -
⅓; 9261
5. 20; y
4
∕x
6. 1∕512; x
15
7. 3.4×10
-11
; 5×10
9
8. 3; 5; 28
bonus: 909; -1982
Sheet 8a:
1. x
2
– xy – 6y
2
3. –x
2
+ 5x – 6 5. 2a
2
– 7ab – 15b
2
7. W
2
– 4
9. –x
2
+ 8x + 33
Sheet 8b:
1. (x + 1)(x + 3) 3. (x + 4)(x + 2) 5. (x – 2)(x – 12)
7. (x + 3)(x + 6) 9. (x + 4)(x + 5)
