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Solve the simultaneous equations y = 3x; 4y - 5x =14

Mathematics
WAEC 1993

Solve the simultaneous equations y = 3x; 4y - 5x =14

  • A. .-2,-6
  • B. 2,6
  • C. 2,-6
  • D. -2,6
  • E. -1,-3
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Correct Answer: Option B
Explanation

y = 3x  ... (i);

4y - 5x =14  ... (ii)

Put 3x for y in (ii).

4(3x) - 5x = 14

12x - 5x = 14

7x = 14 \(\implies\) x = 2.

y = 3x = 3(2) = 6

(x, y) = (2, 6)

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts