Figuring out a square

Algebra Level 3

Which of the following graphs represents a unit square?

Notation : | \cdot | denotes the absolute value function .

2 x + y + 2 y + x = 1 \mid 2x + y \mid + \mid 2y + x \mid = 1 x + y = 1 \mid x \mid + \mid y \mid = 1 x + y + x y = 1 \mid x + y \mid + \mid x- y \mid = 1 2 x y + 2 y x = 1 \mid 2x - y \mid +\mid 2y-x \mid = 1

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