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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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4x = 7
divide both sides by 4
x = 7/4 = 1.75
But in linear congrugrence, negative or decimal values are not allowed, so, we add 9 to the initial equation (because it's in mod 9)
4x = 7 + 9
4x = 16
divide both sides by 4
x = 16/4
x = 4
Ans D
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