Question

Solve equation 7x + 14 = 21 to find value of x.

(a) x = 1

(b) x =-1

(c) x = 2

(d) x = -2

I got this question in an online interview.

I would like to ask this question from Solving Linear Equations with Variables on One Side and Number on the Other topic in portion Linear Equations in One Variable of Mathematics – Class 8

Answer 1

Right option is (a) x = 1

To explain I would say: 7x + 14 = 21

Step 1: Solving the equation, we take constant 14 on the RHS making 7x = 7

Step 2: Dividing LHS and RHS with 7 we get x = 1.