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})$