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Find the least value of x which satisfies the equation 4x = 7(mod 9)

Mathematics
WAEC 2020

Find the least value of x which satisfies the equation 4x = 7(mod 9)

  • A. 7
  • B. 6
  • C. 5
  • D. 4
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Correct Answer: Option D
Explanation

4x = 7 (mod 9)

4x = 7 + 9 (mod 9)

\(\frac{4x}{4} = \frac{16}{4}\) (mod 9)

x = 4


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JAMB CBT Mobile App 2024 - Free Download
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WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
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WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
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