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Question-55006




Question Number 55006 by naka3546 last updated on 16/Feb/19
Answered by MJS last updated on 16/Feb/19
x=y=z=1 is a solution  (1) ⇒ z=((x+y−xy)/(x+y−1))  (2) ⇒ y=−((x−3)/2)±(((x−1)(√3))/2)i ⇒ z=−((x−3)/2)∓(((x−1)(√3))/2)i  2 equations in 3 variables give a parametric  solution
$${x}={y}={z}=\mathrm{1}\:\mathrm{is}\:\mathrm{a}\:\mathrm{solution} \\ $$$$\left(\mathrm{1}\right)\:\Rightarrow\:{z}=\frac{{x}+{y}−{xy}}{{x}+{y}−\mathrm{1}} \\ $$$$\left(\mathrm{2}\right)\:\Rightarrow\:{y}=−\frac{{x}−\mathrm{3}}{\mathrm{2}}\pm\frac{\left({x}−\mathrm{1}\right)\sqrt{\mathrm{3}}}{\mathrm{2}}\mathrm{i}\:\Rightarrow\:{z}=−\frac{{x}−\mathrm{3}}{\mathrm{2}}\mp\frac{\left({x}−\mathrm{1}\right)\sqrt{\mathrm{3}}}{\mathrm{2}}\mathrm{i} \\ $$$$\mathrm{2}\:\mathrm{equations}\:\mathrm{in}\:\mathrm{3}\:\mathrm{variables}\:\mathrm{give}\:\mathrm{a}\:\mathrm{parametric} \\ $$$$\mathrm{solution} \\ $$

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