GCSE Maths

Answering Algebra

Let's see how you got on:
  1. y - 4 = 10
    Add 4 to both sides: y - 4 + 4 = 10 + 4
    Answer: y = 14
  2. 17 - b = 5
    Add b to both sides: 17 - b + b = 5 + b
    So: 17 = 5 + b
    Subtract 5 from each side: 17 - 5 = 5 + b - 5
    Answer: 12 = b
  3. 50 - 2a = 30
    Add 2a and subtract 30 from each side:
    50 - 2a + 2a - 30 = 30 + 2a - 30
    50 - 30 = 2a
    20 = 2a
    Answer: a = 10
Once you get used to this, you don‘t need to write all the steps given above:

e.g. y - 4 = 10
y = 10 + 4 = 14


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