Algebra 1 Common Core Student Edition, Grade 8-9

and ( - 1 , - 1 ) and the other passing through ( - 1 , 1 ) a n d
(1, - 1 ). Four triangles are formed by these lines; upper,
left, and lower ones are shaded. Right triangle is not
shaded.

Chapter Review pp. 408-410

1. inconsistent 2. elimination 3. system of linear
   equations 4. (- 8 , - 1 1 ) 5. (-2, 6 ) 6. (-3, -3 ) 7. no
   solution 8. (~ y , - y ) 9. infinitely many solutions


2. 4 yr 11. The lines will be parallel. 12. (4, 7)


3. (3, - 1 0 ) 14. no solution 15. (-1, -2) 16. infinitely
   many solutions 17. (-{ 7 , ~ y r ) 18. $55 19. no
   solution 20. (-1, 13) 21. (-11, -7) 22. (5, 12)


4. (4.5, 3) 24. infinitely many solutions 25. small
   centerpiece: 25 min, large centerpiece: 40 min

u /

/ X

(^0) /
/
/
1 /
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{
/ r
y
V
"-L s
N X
Ch ap t er 7
Get Ready! p. 415

1. 0.7 2. 6.4 3. 0.008 4. 3.5 5. 0.27 6. 49 7. 5.09


2. 0.75 9. 4 10. 16 11. 4 12. 2000 13. -147


3. 100 1 5 .4 9 16. 117 17. -31 18. 33% increase


4. 25% decrease 20. 17% decrease 21. 5%
   increase 22. {- 8 , 0, - 2 4. 5 } 23. {18, 10, - 3 2. 8 7 5 }


5. {-11, -1 , 16.5} 25. yes; how quickly the plant
   grows 26. The quantity would increase rapidly.


6. decreasing

Lesson 7-1 pp. 418-423

Go t It? 1a.

c. d. 2 a 3 e.

£b.1^2 a.

±5 3a. ^ b. 50 15,625

b. n 3

mAn d.

e. It is easier to simplify first. That gives you, 1 x 1 = 1.

4. 600 represents the number of insects 2 weeks before
   the population was measured; 5400 represents the
   population when it was measured; 16,200 represents
   the number of insects 1 week after the population
   was measured.
   Lesso n Ch eck 1. y- 2. 1, m + 0 3. =y 4. 4x3


5. -2 6. i 7. division 8. b° is equal to 1, not 0;
   15. -1 17. 1 19. 0.4
   1
   c5d7

x" _a " x " _ n..n

a-n b o - 1 - a x

Ex e r c i se s 9. g 1 1. y 1 3. ^

or £ y 21. 4a, b * 0 23. 4 25. (^4) yn 27. x y-f- 29.

31. 4s 3 33. ac-%, 5 d * 0 35. 4r u 37. -=L 11 39. -225


32. | 43. |y 45. 100; there were 100 visitors 4 months
    before the number of visitors was measured.


33. negative 49. negative 51. 10 -1 53. 10 -3
    55a. 5“ 2, 5“ 1, 5°, 5 1, 5 2 b. 54 c. an 57. 4 gh~3


34. 61>
    11
    n 3 16 7 58 2

'

n_1 31 6 17 85 0.5

63. Answers may vary. Sample: Let a = j , then
    a”1 = |, a^2 = |, and a-2 = |. 65. No; answers may