Mathematics

If 2x + y = 7 and 3x – 2y = 3, by how much…

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