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If 3x - 2y = - 5 and x + 2y = 9, find the...

Mathematics
WAEC 2024

If 3x - 2y = - 5 and x + 2y = 9, find the value of \(\frac{x - y}{x + y}\)

  • A. \(\frac{5}{3}\)
  • B. \(\frac{3}{5}\)
  • C. \(\frac{-3}{5}\)
  • D. \(\frac{-5}{3}\)
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Correct Answer: Option C
Explanation

Solving 3x - 2y = -5 and x + 2y = 9 simultaneously using elimination method

3x - 2y = - 5 ----------- (i)

x + 2y = 9 ----------- (ii)

4x = 4

x = 1

put x = 1 into eqn ---(ii)

x + 2y = 9 becomes  1 + 2y = 9

2y = 9 - 1 = 8

y = \(\frac{8}{2}\) = 4

x = 1 and y = 4

Therefore, \(\frac{x - y}{x + y}\) = \(\frac{1 - 4}{1 + 4}\) = \(\frac{- 3}{5}\)

 


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