2. Multiple Choice Questions.
a. 1 + 2x + 3x + 4x = 4x is an equation in:
(i) 1 variable (ii) 2 variables (iii) 3 variables (iv) 4 variables
b. A number added to itself gives 36. The number is:
(i) 18
(ii) 20 (iii) 24 (iv) 36
c. If a number is multiplied by 5, and 8 is subtracted from the
product, the result is 12, then the number is
(i) 4
(ii) 6 (iii) 8 (iv) 2
3
4
d. The solution of the equation - (x - 1) = x - 3 is
(i)x=8
(ii) x = 9
(iii) x = 7
(iv) x = 6
Answers
Answer:
a) option 1
b)option 1
c) option 1
d) option 4
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Answer:
a. (i) 1 Variable
b. (i) 18
c. (i) 4
d. (v) x = 2
Step-by-step explanation:
a. Since, x is the only variable in the given equation:
Therefore, only 1 variable is present in the equation.
b. Since a number is adding itself, we must divide 36 by 2.
36/2 = 18
Therefore, 18 is the required number.
c. First, we add 8 to 12.
12 + 8 = 20
Now, we divide it by 5.
20/5 = 4
Therefore, 4 is the required number.
d. The working is down below:
- (x - 1) = x - 3
= - x + 1 = x - 3 [Removing the bracket from Left Hand Side (LHS)]
= - x - x = - 3 - 1 [Subtracting x and 1 on both sides]
= - 2x = -4
= 2x = 4 [Removing the common negative " - " sign]
= x = 4/2 [Dividing 2 on both sides]
= x = 2
Hope you got the answers.