Algebra I Summary

GCSE Maths

Algebra is just where we use letters to represent numbers. e.g. z = 42

We can write expressions like c - 100 = 400 and work out what the letter represents by manipulating the equation.

What we do on the left of the equals sign we must do on the right.

Choose to add or subtract numbers that help you, e.g. + 100 to the expression above: c = 400 + 100 = 500

Letters can be manipulated in the same way, e.g. 100 - q = 60. Solve by adding q to each side.

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