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Check your answer poster

How to check your answer: put it back in

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A4 portrait. It is drawn in vector form, so it also prints sharply scaled up to A3.

The poster

Classroom poster: how to check your answer, put it back in. Substitute your answer into the original equation. Do both sides match? 3x + 4 = 19 gives x = 5. Check: 3 × 5 + 4 = 19 ✓
How to check your answer: put it back in. IB Math Revision, free for classroom use.

The maths

Substitute your answer into the original equation. Do both sides match? For example: 3x + 4 = 19 gives x = 5. Check: 3 × 5 + 4 = 19 ✓

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