3x+2y=9and xy=3find 27xcube+8ycube
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2y=9-3x
y=9-3x/2
xy=3
x(9-3x/2)=3
9x-3x²/2=3
9x²-3x=6
divide by 3
3x²-x=2
3x²-x-2=0
x=3,x=-2
y=1, y=-3/2
y=9-3x/2
xy=3
x(9-3x/2)=3
9x-3x²/2=3
9x²-3x=6
divide by 3
3x²-x=2
3x²-x-2=0
x=3,x=-2
y=1, y=-3/2
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