`<=> ` \(\left\{{}\begin{matrix}6x-3\sqrt{y}=9\\x+3\sqrt{y}=2\end{matrix}\right.\)
`<=> {(7x = 11), (2x-sqrty=3):}`
`<=> {(x=11/7), (2 . 11/7 - sqrt y = 3):}`
`<=> {(x=11/7), (y = (22/7-3)^2):}`
\(\left\{{}\begin{matrix}\sqrt{y}=3-2x\\x+3\sqrt{y}=2\end{matrix}\right.\left\{{}\begin{matrix}\sqrt{y}=3-2x\\x+9-6x=2\end{matrix}\right.\left\{{}\begin{matrix}\sqrt{y}=3-2x\\-5x=-7\end{matrix}\right.\left\{{}\begin{matrix}\sqrt{y}=3-2y\\x=\dfrac{7}{5}\end{matrix}\right.\left\{{}\begin{matrix}\sqrt{y}=3-2x\\x=\dfrac{7}{5}\end{matrix}\right.\left\{{}\begin{matrix}\sqrt{y}=3-2.\dfrac{7}{5}\\x=\dfrac{7}{5}\end{matrix}\right.\left\{{}\begin{matrix}\sqrt{y}=\dfrac{1}{5}\\x=\dfrac{7}{5}\end{matrix}\right.\left\{{}\begin{matrix}y=\dfrac{1}{25}\\x=\dfrac{7}{5}\end{matrix}\right.\\\)vậy ...
