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1. x + [TEX]x^2.y[/TEX] = 6[TEX]y^2[/TEX]
... 1 + [TEX]x^2.y^2[/TEX] = 5[TEX]y^2[/TEX]
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2. xy + x + 1 = 7y
... [TEX]x^2.y^2[/TEX] + xy + 1 = 13[TEX]y^2[/TEX]
... 1 + [TEX]x^2.y^2[/TEX] = 5[TEX]y^2[/TEX]
_________________________
2. xy + x + 1 = 7y
... [TEX]x^2.y^2[/TEX] + xy + 1 = 13[TEX]y^2[/TEX]