If 2x + y = 7 and 3x - 2y = 3, by how much
MATHEMATICS
WAEC 1991
If 2x + y = 7 and 3x - 2y = 3, by how much is 7x greater than 10?
- A. 1
- B. 3
- C. 7
- D. 10
Correct Answer: C. 7
Explanation
2x + y = 7 = i
3x - 2y = 3 = ii
i x 2 + ii = 4x + 2y = 14
\(\frac {3x - 2y = 3}{7x = 17}\)
x = \(\frac {17}{7}\) = 7x = 17 x 1/7 x 7
17 - 10 = 7
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