0580/21 Oct/Nov 2021, Question 8: Simultaneous Equations by Elimination
Cambridge IGCSE Mathematics 0580 · Paper 21 (Extended) · Calculator · 3 marks
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The question, in short
Solve the simultaneous equations 4x − 2y = −13 and −3x + 4y = 11, showing all working.
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Solution · 3 marks
- 1Multiply the first equation by 2: 8x − 4y = −26
- 2Add −3x + 4y = 11: 5x = −15, so x = −3
- 34(−3) − 2y = −13, so −2y = −1
- 4x = −3, y = 0.5
Answerx = −3, y = 0.5
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Also searched as: 0580/21/O/N/21 · 0580_w21_qp_21 · 0580 w21 21 · question 8.
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