CBSE · Class 6-12

Class 7 · Ganita Prakash

Unit 15 · Class 7Ganita Prakash

Finding the Unknown

Solving simple linear equations.

Lessons

3 concepts

1
The Golden Rule
Whatever you do to one side, do to the other. Adding, subtracting, multiplying, or dividing both sides preserves the equation.
2
Transposition Shortcut
Move terms across the $=$ sign, flipping their sign: $x+3=7 \Rightarrow x=7-3=4$ .
3
Verification
Always substitute back. If both sides agree, solution is correct.

Skills to practise

Skill · medium

Finding the Unknown — Practice