Congruence Modulo Integer/Examples/3 equiv 15 mod 4

Example of Congruence Modulo an Integer

 * $3 \equiv 15 \pmod 4$

Proof
By definition of congruence:
 * $x \equiv y \pmod n$ $x - y = k n$

for some $k \in \Z$.

We have:
 * $3 - 15 = -12 = \paren {-3} \times 4$

Thus:
 * $3 \equiv 15 \pmod 4$