Question

x+y=7;9y-2x=25 срочнооооо

Answer 1

$\left \{ {{x+y=7} \atop {9y-2x=25}} \right. \\\\x=7-y\\9y-2(7-y)=25\\9y-14+2y=25\\11y=39\\y=\frac{39}{11} \\x=7-\frac{39}{11}=\frac{38}{11} \\(\frac{38}{11};\frac{39}{11})$