MP Board Class 8th Maths Solutions Chapter 2 Linear Equations in One Variable Ex 2.3

October 4, 2021

Solve the following equations and check your results.

Question 1.
3x = 2x + 18
Solution:
We have, 3x = 2x + 18
Transposing 2x to L.H.S., we get
3x – 2x = 18 ⇒ x = 18
Checking: L.H.S. = 3 × 18 = 54
R.H.S. = 2x + 18 = 2 × 18 + 18 = 36 + 18 = 54
Thus, L.H.S. = R.H.S.

Question 2.
5t – 3 = 3t – 5
Solution:
We have, 5t – 3 = 3t – 5
Transposing 3t to L.H.S., we get
5t – 3 – 3t = – 5
⇒ 2t – 3 = – 5
Transposing – 3 to R.H.S., we get
2t = -5 + 3
⇒ 2t = – 2
Dividing both sides by 2, we get

Checking : L.H.S. = 5t – 3 = 5 × (-1) – 3 = -5 – 3 = -8
R.H.S. = 3t – 5 = 3 × (-1) – 5 = -3 – 5 = -8
Thus, L.H.S. = R.H.S.

Question 3.

Question 4.

Question 5.

Question 6.
8x + 4 = 3(x – 1) + 7
Solution:
We have, 8x + 4 = 3(x – 1) + 7
⇒ 8x + 4 = 3x – 3 + 7 ⇒ 8x + 4 = 3x + 4
Transposing 3x to L.H.S., we get
8x + 4 – 3x = 4 ⇒ 5x + 4 = 4
Transposing 4 to R.H.S., we get
⇒ 5x = 4 – 4 ⇒ 5x = 0
Dividing both sides by 5, we get

Checking: L.H.S. = 8x + 4 = 8 × 0 + 4 = 4
R.H.S. = 3(x – 1) + 7 = 3(0 – 1) + 7 = -3 + 7 = 4
Thus, L.H.S. = R.H.S.