Proof on the divisibility of integers

  1. 1. The problem statement, all variables and given/known data

    Let a,b be integers where a doesn't =0. Prove that if a divides b, and b divides a, then a=b or a=-b

    3. The attempt at a solution

    I started out with b=aj and a=bk, where j,k are integers. Don't quite know how to proceed
  2. jcsd
  3. Mark44

    Staff: Mentor

    Substitute the expression for a or b into the other equation. What do you get?
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