If 2x + y = 7 and 3x – 2y = 3, by how much is 7x greater than 10?
-
A.
1 -
B.
3 -
C.
7 -
D.
10 -
E.
17
Correct Answer: Option C
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