How do u solve the following equation: |r|=1

You're almost looking at the solution. Almost.

If it only said " r = 1 ", then that would be the solution right there.

But it says " | r | = 1 ", so there's a little more to it.

'r' can be either + 1 or - 1 and that equation will be a true statement.

So + 1 and - 1 are both solutions.