CLASS 6TH | UNIT 3: ALGEBRA | FUNDAMENTAL CONCEPTS | REVISION NOTES

Introduction to Algebra :-

The main feature of algebra is the use of letters, which allow us to write rules
and formulas in the general ways and one can talk about any number and not
just a particular number. Letters may stand for unknown quantities,
numbers, operation can be performed on them as numbers.
Example :
Find the value of y in the equation.
𝑦
7

• 3 = 0
  Solution : 𝑦
  7
• 3 = 0
  Multiply by 7 in both sides,
  =7 ( 𝑦
  7
• 3 ) = 0 x 7
  =7 x 𝑦
  7
• 7 x 3 = 0
  =Y + 21 = 0
  Subtract 21 in both sides
  = Y + 21 – 21 = 0 – 21
  =Y = – 21
  Hence , the value of y = -21