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JAMB Mathematics 1980 Question 22

Question 22

Linear and Simultaneous Equations

Three numbers, x, y and z, are connected by the relationships y = 4/9x + 1 and z = 4/9y + 1. If x = 99 find z

  1. A.6⅓
  2. B.20
  3. C.21
  4. D.1764/9
  5. E.None of the above.
Show the answer and explanation

Answer: C (21)

Explanation

y = 4/9 × 99 + 1 = 45, then z = 4/9 × 45 + 1 = 21.