Question

Q3. Find the value of A to make the expression true:-
a) 66÷a=-11
b) 90÷-a=5
c) a÷1=-16
d) -81÷a-2=-9​

Answer 1

Step-by-step explanation:

1) 66/a= -11

a= -11/66

a= -1/6

2)90/-a= 5

-a= 5/90

-a= 1/18

a= -1/18

3)a/1 = -16

a=-16

4)-81/a-2=-9

=-9×a-2/-81

=-9a+18/-81

=-9(a-2)/-81

=a-2/9

-a= -2/9

a= 2/9

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Answer 2

Answer:

a) 66 = -11

a

Cross multiplication

66*1 = -11*a

= 66= -11a

= a=66

-11

a= -6 Ans

b)90= 5

a

= Cross multiplication

90*1=5*a

= 90=5a

= a= 90

5

a= 18 Ans

c) a= -16

1

Cross multiplication

= -16*1=a*1

= -16=a

=a=-16 Ans

d)-81- 2 =-9

a

= Cross multiplication

= -81-2*1=-9*a

= -81-2 = -9a

= -83 = -9a

= a= -83

-9 Ans

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