4MA1/2HR Jan 2020, Question 7: Simultaneous Equations by Elimination
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2HR (Higher) · Calculator · 3 marks
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The question, in short
Solve the simultaneous equations 3x + 5y = 6 and 7x − 5y = −11, showing clear algebraic working.
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Solution · 3 marks
- 1Add the equations to remove y: 10x = −5
- 2x = −0.5
- 3Substitute into 3x + 5y = 6: −1.5 + 5y = 6
- 45y = 7.5, so x = −0.5, y = 1.5
Answerx = −0.5, y = 1.5
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