Question

дам 27 баллов, помогите, пожалуйста!!

Answer 1

$-\displaystyle\left \{ {{(2x+3)-2(7y+6)=28} \atop {(2x+3)+(7y+6)=13}} \right.\\--------------\\-2(7y+6)-(7y+6)=15\\\\-3(7y+6)=15\\\\7y+6=-5\\\\7y=-11\\\\y=-1\dfrac{4}{7}\\\\(2x+3)-5=13\\\\2x+3=18\\\\2x=15\\\\x=7,5\\\\Otvet:\boxed{(7,5 \ ; \ -1\frac{4}{7})}$