Question

How does 5k=2(mod 7) equal
k=6(mod 7) ?

Answer 1

k in an integer btw

Answer 2

k is a*

Answer 3

because if
\[5k\equiv 2(\text{mod} 7)\] then also
\[5k\equiv 2+4\times 7=30(\text{mod} 7)\] and so
\[k\equiv 6(\text{mod} 7)\]

Answer 4

well if u multiply the 2nd by 5, we get 5k = 30 (mod7)....but 30 (mod 7) is 2 (mod 7)

Answer 5

also what qed said!

Answer 6

;)

Answer 7

ty