4024/12 May/Jun 2021, Question 11: Simultaneous Equations by Elimination
Cambridge O Level Mathematics 4024 · Paper 12 (Non-calculator) · Non-calculator · 4 marks
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The question, in short
Solve the simultaneous equations 5x + 2y = 7 and 2x − 3y = 18, showing working for 4 marks.
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Solution · 4 marks
- 1(1) × 3: 15x + 6y = 21
- 2(2) × 2: 4x − 6y = 36
- 3Add: 19x = 57, so x = 3
- 45 × 3 + 2y = 7 → 2y = −8 → y = −4
- 5x = 3, y = −4
Answerx = 3, y = −4
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Also searched as: 4024/12/M/J/21 · 4024_s21_qp_12 · 4024 s21 12 · question 11.
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