What is the essential rule for algebraic equations?

Always do the same to both sides of the equation

If you minus from one side, you add to the other

How would you work out 4y+2=2y+8

(-2y) 2y+2=8 (-2) 2y = 6 (divide by 2) y = 3

(-2) 4y = 2y+6 (-6) 4y - 6 = 2y (-4y) -6 = -2y (+6) 0 = -2y+6 (+2y) 2y = 6 (divide by 2) y = 3

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Ellen Billingham 5 questions

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1What is the first thing you do to a linear equation with an x on both sides?
1. AGet rid of the smaller x
2. BAdd them together
2What is the essential rule for algebraic equations?
1. AIf you minus from one side, you add to the other
2. BAlways do the same to both sides of the equation
3How would you work out 4y+2=2y+8
1. A(-2y) 2y+2=8
  (-2) 2y = 6
  (divide by 2) y = 3
2. B(-2) 4y = 2y+6
  (-6) 4y - 6 = 2y
  (-4y) -6 = -2y
  (+6) 0 = -2y+6
  (+2y) 2y = 6
  (divide by 2) y = 3
4What does n equal in this equation?
5n - 2 = n + 46
1. An = 12
2. Bn = 48
5What does 3(y + 2) mean?
1. A3y + 2
2. B3y + 6

Description: GCSE Maths (Year 8 Algebra 3) Quiz on Linear Equations with unknowns on Both Sides, created by Ellen Billingham on 07/05/2013.
Author: Ellen Billingham
Language: English
Views: 124
Tags: maths year 8 algebra 3 maths year 8 algebra 3 gcse
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