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2011-06-24T23:33:52+02:00

x²=27y

y=(x-3)/2

 

x²=27(x-3)/2

2x²=27x-81

2x²-27x+81=0

 

Δ=(-27)²-4*2*81

Δ=729-648

Δ=81

√Δ=9

 

x₁=(-(-27)-9)/(2*2)

x₁=18/4

x₁=9/2

 

x₂=(-(-27)+9)/(2*2)

x₂=36/4

x₂=9

 

y₁=(9/2-3)/2

y₁=(9/2-6/2)/2

y₁=(3/2)/2

y₁=3/4

 

y₁=(9-3)/2

y₁=6/2

y₁=3