Hello, I need help with the following problem.

Use the division algorithm to prove that if $\displaystyle a$ and $\displaystyle b$ are integers with $\displaystyle b \neq 0$, then there exist unique integers $\displaystyle q$ and $\displaystyle r$ such that $\displaystyle a=bq+r$, with $\displaystyle 0 \leq r < |b|$

Thanks in advance