Wyznacz x i y : ( układy równań )
xy-y+x+1=0
xy - y + x + 1 = 0
y (x - 1) + (x + 1) = 0
y (x - 1) = - (x + 1) x ≠ 1
y = - (x + 1) / (x - 1)
xy + x - y + 1 = 0
x (y + 1) - (y - 1) = 0
x (y +1) = (y - 1) y ≠ - 1
x = (y - 1) / (y + 1)
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xy - y + x + 1 = 0
y (x - 1) + (x + 1) = 0
y (x - 1) = - (x + 1) x ≠ 1
y = - (x + 1) / (x - 1)
xy - y + x + 1 = 0
xy + x - y + 1 = 0
x (y + 1) - (y - 1) = 0
x (y +1) = (y - 1) y ≠ - 1
x = (y - 1) / (y + 1)