Question

решите систему уравнений ​

Answer 1

$\displaystyle\bf\\\left \{ {{3^{-x} \cdot 2^{y} }=\dfrac{4}{9} \atop {x+y=4}} \right.\\\\\\\left \{ {{\dfrac{2^{y} }{3^{x} } =\dfrac{2^{2} }{3^{2} } } \atop {x+y=4}} \right. \\\\\\\left\{\begin{array}{ccc}y=2\\x=2\\2+2=4-verno\end{array}\right \\\\\\Otvet \ : \ (2 \ ; \ 2)$