1. J

    why does |x - 1| - |x - 2| = 1 equate to 2 <(and equal to) x < infinity?

    The reason why I ask this is that I bought a calculus book and this one question has been boggling me for a while. The book gives very little detail as to how they found it except something to do with distance with absolute values, which is understandable but doesn't explain it very well