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[TEX] 10.(y-x)^2 + 9x(y-x) = 0[/TEX]
[TEX](y-x).(10.(y-x) + 9x )= 0[/TEX]
[TEX] (y-x) = 0 , \Rightarrow x =y[/TEX]
[TEX]10.(y-x) + 9x = 0[/TEX]
[TEX]10y -10x +9x = 0[/TEX]
[TEX]x= 10y[/TEX]
 
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