CLASS 7 - ASSIGNMENT 2 - LINES AND ANGLES AND SIMPLE EQUATIONS

 

CLASS 7

REVISION 2 

LINES AND ANGLES AND SIMPLE EQUATIONS



  

 2. Find the supplement of the following:

     (i) 105°    (ii) 138°   (iii) 126°

 

3.   Find in the blanks:

  

x

2

7

9

15

19

30

x+12







23-x








 

4. Find the value of x in each of the following:


(i) x + 2 = 10


(ii) x - 14 = 38


(iii) 2x + 4 = 20


(iv) (x/5) + 3 = 33


(v) 3x - 12  = 72


(vi) (4x/5) - 23 = 17


(vii) 4x - 9 = -19


(viii) 5x + 21 = -49


(ix) (2x/3) + 4/5 = 11/5


(x) (x/7) - 1/8 = 1/6


(xi) x/12 = 36/24


(xii) 6x = 72/15


5. Find the value of the unknown angle in the following triangles: ( All angles are in degrees)

 

  1.       

36

48

x


      2.

97

z

67


      3.

45

65

y


      4.

90

x

30


      5.

z

32

78


      6.

x

33

77


      7.

25

y

105



6. Write equations for the following statements:


(i) The sum of numbers x and 12 is 20.


(ii) The difference of x and 6 is 18 (x being the greater number).


(iii) y subtracted from 21.


(iv) The product of  x and 7.


(v) Thirty times y is 300.


(vi) Five times b plus 5 gives 25.


(vii) One-third of a number y plus 3 gives 12.


(viii) 6 added to half of a number x gives 30.


7. Write the following equations in statement forms:


(i) t + 5 = 8


(ii) m - 3 = 9


(iii) x/5 = 14


(iv) 2m + 15 = 25


(v) 8x = 80


(vi) 5y - 7 = 23


(vii) (x/2) + 8 = 20


(viii) (y/4) - 9 = 1


8. Solve the following equations:


(i) 3 ( m - 5 ) = 12


(ii) 6 ( y + 12 ) = 70


(iii) 2 ( x - 3/2 ) = 40


(iv) 7 ( 3x - 1 ) = 14


(v) 9 ( x-2 ) - 3 ( x-1 ) = 0


(vi) 5 ( 3x + 4 ) = 18







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