4MA1/2F Nov 2021, Question 18: Solving Linear Equations
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 4 marks
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The question, in short
Two rectangles have side lengths in cm: A is (5 − x) by 4, B is (2x − 1) by 5. Given B's area is twice A's, find x showing working.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 4 marks
- 1Area A = 4(5 − x) = 20 − 4x; area B = 5(2x − 1) = 10x − 5
- 2B is twice A: 10x − 5 = 2(20 − 4x) = 40 − 8x
- 318x = 45
- 4x = 2.5
Answer2.5
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