If 3x o 4(mod 5), find the least value of x
MATHEMATICS
WAEC 2018
If 3xo 4(mod 5), find the least value of x
- A. 1
- B. 2
- C. 3
- D. 4
Correct Answer: C. 3
Explanation
3x \(\equiv\) 4(mod 5)
In modulo 5, multiples of 5 that give solution to the given equation are 5, 20, 35, 50,... but 5 will yield the leaast value of x.
Thus; 3x = 4 + 5 = 9
x = \(\frac{9}{3}\)
x = 3
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