If 3p - q = 6 and 2p + 3q = 4, find q
MATHEMATICS
WAEC 1996
If 3p - q = 6 and 2p + 3q = 4, find q
- A. 0
- B. 1/2
- C. 2/3
- D. 1
Correct Answer: A. 0
Explanation
3p - q = 6 ........ 1
2p + 3q = 4 ....... 2
Multiply eqn 1 by 3
9p - 3q = 18 ........ 3
2p - 3q = 4 ......... 2
Add eqn3 and eqn2
11p = 22 => p =22/11 = 2
Substitute for p =2 in eqn1
3p - q = 6
3x2 - q = 6 => 6 - q = 6 => -q = 6 - 6
q = 0
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