If x + y = 12 and 3x - y = 20, find the value
MATHEMATICS
WAEC 2006
If x + y = 12 and 3x - y = 20, find the value of 2x - y
- A. 8
- B. 10
- C. 12
- D. 15
Correct Answer: C. 12
Explanation
x + y = 12
+ 3x - y = 20
---------------
4x = 32
x = 8
x + y = 12; 8 + y = 12; y = 12 - 8
= 4
2x - y = 2(8) - 4; 16 - 4 = 12
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