Solve the equation 2x - 3y = 22; 3x + 2y = 7
MATHEMATICS
WAEC 2005
Solve the equation 2x - 3y = 22; 3x + 2y = 7
- A. -5
- B. -4
- C. 4
- D. 5
Correct Answer: B. -4
Explanation
2x - 3y = 22 ---- eqn I
3x + 2y = 7 ---- eqn II
multiply eqn I by 2
4x - 6y = 44 ---- eqn III
multiply eqn II by 3
9x + 6y = 21 ---- eqn IV
Adding eqn III and IV
=> 13x = 65 => x = 5
Substituting 5 for x in eqn II
3x5 + 2y = 7 => 2y = -8
y = -4
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