|x| + |y| = 1 (Hint: This is not the graph of a function, but is made up of four straight-line segments. Find them by using the definition of absolute value in these four cases: x ≥ 0 and y ≥ 0; x ≥ 0 and y < 0; x < 0 and y ≥ 0; x < 0 and y < 0).
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