Question

Solve each of the following equations and verify the answer in each case:
4x + 7 = 15

Answer 1

4x + 7 = 15
⇒ 4x + 7 − 7 = 15 − 7 [Subtracting 7 from both the sides]
⇒ 4x = 8
⇒ $\frac{4x}{4}=\frac{8}{4}$ [Dividing both the sides by 4]
⇒ x = 2
Verification:
Substituting x = 2 in the L.H.S.:
⇒ 4$\times$2 + 7 = 8 + 7 = 15 = R.H.S.
L.H.S. = R.H.S.
Hence, verified.