x+y=6 y=6-x
1/x+2/y=1
(y+2x)/xy=1
2x+y=xy
2x+6-x=x*(6-x)
x+6=6x-x²
x²-5x+6=0 D=1
x₁=3 y₁=3
x₂=2 y₂=4.
x+y=6 y=6-x
1/x+2/y=1
(y+2x)/xy=1
2x+y=xy
2x+6-x=x*(6-x)
x+6=6x-x²
x²-5x+6=0 D=1
x₁=3 y₁=3
x₂=2 y₂=4.