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

  • A 7
  • B 6
  • C 5
  • D 4
waec 2020mathematics

The correct answer is D. 4

4x = 7 (mod 9)

4x = 7 + 9 (mod 9)

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

x = 4

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