0580/11 May/Jun 2021, Question 21: Simultaneous Equations by Elimination
Cambridge IGCSE Mathematics 0580 · Paper 11 (Core) · Calculator · 3 marks
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The question, in short
Solve the simultaneous equations 2x + y = 3 and x − 5y = 40, showing all working.
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Solution · 3 marks
- 1From 2x + y = 3: y = 3 − 2x
- 2x − 5(3 − 2x) = 40
- 3x − 15 + 10x = 40, so 11x = 55
- 4x = 5, y = 3 − 10 = −7
- 5x = 5, y = −7
Answerx = 5, y = −7
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Also searched as: 0580/11/M/J/21 · 0580_s21_qp_11 · 0580 s21 11 · question 21.
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