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
waec 1991mathematics

The correct answer is C. 7

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

Previous question Next question