WAEC Mathematics 2020 Objective — Question 10
Question 10 of 50 from the West African Examinations Council (WAEC) Mathematics 2020 Objective paper, with the correct answer and a full explanation.
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Solve 3x - 2y = 10 and x + 3y = 7 simultaneously.
- A. x=-4 and y=1
- B. x=-1 and y=-4
- C. x=1 and y=4
- D. x=4 and y=1Correct
Explanation
From x+3y=7, x=7-3y. Substituting into 3(7-3y)-2y=10 gives 21-9y-2y=10, -11y=-11, y=1, so x=7-3=4. Thus x=4, y=1.
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