2.1.9

Rearrange For x

Test yourself

Rearranging Formulae

When rearranging a formula make sure that anything you do to one side of the equation you also do to the other side. To make x the subject of the
equation 3x - 9y = 4x - 24:

Illustrative background for Subtract 4x from both sidesIllustrative background for Subtract 4x from both sides ?? "content

Subtract 4x from both sides

  • We do this so that all the x terms are on one side.
Illustrative background for Add 9y to both sidesIllustrative background for Add 9y to both sides ?? "content

Add 9y to both sides

  • We do this so that all the y terms are on the other side.
Illustrative background for Multiply both sides by (-1)Illustrative background for Multiply both sides by (-1) ?? "content

Multiply both sides by (-1)

  • We have -x but we want x so we must multiply by -1.

Jump to other topics

1Number

1.1Using Numbers

1.2Fractions, Decimals & Percentages

1.3Powers & Roots

1.4Accuracy

2Algebra

2.1Introduction to Algebra

2.2Manipulating Algebra

2.3Proofs & Functions

2.4Straight Line Graphs

2.5Common Graphs

2.6Transformations & Tangents

2.7Properties of Graphs

2.8Solving Equations

2.9Inequalities

2.10Sequences

3Ratio

4Geometry

4.1Introduction to Geometry

4.2Triangles & Quadrilaterals

4.3Transformations

4.4Circle Basics

4.5Circle Theorems

4.6Measurements & Units

4.7Calculating Area

4.8Triangle Formulae

4.93D Shapes

4.10Vectors

5Probability

6Statistics

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