Use the affine cipher ekx 3x 1 to encipher BADGERS What is

Use the affine cipher ek(x) = 3x + 1 to encipher BADGERS. What is the decrypting function dk(x)?

Solution

If the cipher ek(x) = 3x + 1 to encipher BADGERS .
Then accordingly, the decrypting function dk(x) should be =( x-1) / 3

Explanation : y =3x + 1

=> y - 1 = 3x

=>x = (y -1) /3