Created
November 12, 2018 05:43
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| z = a x + b y + c x y + d | |
| x = 0, z = 1 => b y + d === 1 | |
| x = 1, z = y => a + b y + c y + d === y | |
| b y + d === 1 => b == 0, d == 1 | |
| a + c y === y - 1 => c == 1, a = -1 => z = -x + x y + 1 => z = 1 + x * (y - 1) |
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