5. ABC

7. 
C

8. 
a

9. ABC
BC

10. ABC
AB

11. 

12. ABC
C AB
AC BC

13. a A
b B, c
C c
a,b

14. a b

15. ABC

17. 

18. ABC a,b c
ABC C

19. 
ABC
ABC

20. 
ABC

21. 
PQR
QR, PM = 24 PQ = 25 MR = 10
PQR

24. ABCD
ABO

27. 
a b

31. 

32. 
√ , √ , √ , -√ , - √ , -√ ¶

33. a
a a
-
- -
x -
- -
-

34. x4 - x -4
x8 - x -8
x35 - x (-35)

35. a
a a
a
- a a= ,

36. -
-
-

38. a a
a
a
a
- -
- -

39. - -
-

41. x7x7
= (7)3

43. ax + b = 0 a, b a

44. 2x+3 = 0
2a+1 = 0
a, b c
symmetric property)
a=b b=a
transitive property)
a=b b=c a=c

45. distributiveproperty)
a(b+c) = ab + ac
additiveproperty)
a=b a+c=b+c
a-c=b-c
multiplicative property)
a=b
axc=bxc
a/c=b/c c

47. y = mx + c
m Y c
y = 3x + 2 y = 2x - 5
y=x+7
y=-x-8

48. 2.Ax + By + C = 0
x + 2y + 5 = 0
3x - 4y - 12 = 0
8x + 7y - 20 = 0
Ax + By + C = 0
By = - Ax - C
Y=-X-( B
y = mx + c
m=- C=-

49. 3. y = c X
X C
Y=2 X
X=2
Y = -5 X
X=5

50. 4. X = C Y
Y C|
X=3 Y
Y
X = -4 Y
Y

51. X Y X
y=0 y X=0
X Y
a X b Y
X a,0)
Y b)

52. X y = 2x - 5 y
x = 3 , y = 2(3) - 5 = 1
y = 2x –
5
Slope)
y = mx + c m
Ax + By + C = 0 -
y = 2x - 3
x - 2y + 5 = 0

53. y = 3x - 5
X
x + 4y - 12 = 0
X
X
Y

54. Ax + By + C = 0
A,B C A,B
y = mx + c m c

m C
x

56. x
x/6
x/12
x/7
x/2

57.  x = x/6 + x/12 + x/7 + 5 + x/2 + 4
...........................x = x/6 + x/12 + x/7 + x/2 + 9
...........................x = (1/6 + 1/12 + 1/7 + 1/2) x + 9
...........................x = [(14 + 7 +12 + 42) /84] x + 9
...........................x = 75/84 x + 9
.....................84 x = 75 x + 756
.......................9 x = 756
...........................x = 84

58. 

59. f i g h
MN PQ RS

60. MRS = RSQ ( NRS = RSP (
RS MN PQ