Mark M. answered 03/30/15
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Retired Math prof with teaching and tutoring experience in trig.
If l x + y l = 2, then x + y = 2 or x + y = -2
If x + y = 2, then y = -x + 2
If x + y = -2, then y = -x - 2
The graph of the given equation consists of two parallel lines with slope -1. One of the lines has y-intercept (0,-2) and the other line has y-intercept (0, 2).