Find the least value of x which satisfies the equation 4x = 7(mod 9)
A
7
B
6
C
5
D
4
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
4x = 7 (mod 9)
4x = 7 + 9 (mod 9)
\(\frac{4x}{4} = \frac{16}{4}\) (mod 9)
x = 4
Source: Myschool Past Questions Archive (Record #58619)