Solve the equations: 4x -y = 11; 5x + 2y = 4.
MATHEMATICS
WAEC 1997
Solve the equations: 4x -y = 11; 5x + 2y = 4.
- A. x = 6, y = 13
- B. x = -2, y = -3
- C. x = -2, y = 3
- D. x = 2, y = -3
Correct Answer: D. x = 2, y = -3
Explanation
4x - y = 11....(1) x 2 8x - 2y = 22....(3)
5x + 12y = 4....(2) x 1 5x + 2y = 4....(4)
add eqn (3) and (4)
13x = 26
x = 2
4(2) - y = 11 \(\implies\) y = 8 - 11
y = -3.
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