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10x-2-9xy-2y-2-10-please-how-do-I-find-the-ratio-of-x-y-




Question Number 190532 by MathsFan last updated on 05/Apr/23
10x^2 −9xy+2y^2 =10   please how do I find the ratio of   x:y
$$\mathrm{10x}^{\mathrm{2}} −\mathrm{9xy}+\mathrm{2y}^{\mathrm{2}} =\mathrm{10} \\ $$$$\:\mathrm{please}\:\mathrm{how}\:\mathrm{do}\:\mathrm{I}\:\mathrm{find}\:\mathrm{the}\:\mathrm{ratio}\:\mathrm{of} \\ $$$$\:\mathrm{x}:\mathrm{y} \\ $$
Answered by Frix last updated on 05/Apr/23
There′s no general ratio.  10x^2 −9xy+2y^2 =10 ⇔ y=((9x±(√(x^2 +80)))/4)  This is a hyperbola. The slopes of its axes  are −(4/9) and (9/4).
$$\mathrm{There}'\mathrm{s}\:\mathrm{no}\:\mathrm{general}\:\mathrm{ratio}. \\ $$$$\mathrm{10}{x}^{\mathrm{2}} −\mathrm{9}{xy}+\mathrm{2}{y}^{\mathrm{2}} =\mathrm{10}\:\Leftrightarrow\:{y}=\frac{\mathrm{9}{x}\pm\sqrt{{x}^{\mathrm{2}} +\mathrm{80}}}{\mathrm{4}} \\ $$$$\mathrm{This}\:\mathrm{is}\:\mathrm{a}\:\mathrm{hyperbola}.\:\mathrm{The}\:\mathrm{slopes}\:\mathrm{of}\:\mathrm{its}\:\mathrm{axes} \\ $$$$\mathrm{are}\:−\frac{\mathrm{4}}{\mathrm{9}}\:\mathrm{and}\:\frac{\mathrm{9}}{\mathrm{4}}. \\ $$

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