Question on: WAEC Mathematics - 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
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Correct Option: C
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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