Question

{x+y/8 + y/2 = 4
[x/10 - x-y/5 = 1

Answer 1

$left { {{frac{x+y}{8}+frac{y}{2}=4, |cdot 8} atop {frac{x}{10}-frac{x-y}{5}=1, |cdot 10}} right. ; left { {{x+y+4y=32} atop {x-2(x-y)=10}} right. ; left { {{x+5y=32} atop {-x+2y=10}} right. oplus \\left { {{7y=42} atop {x=2y-10}} right. ; left { {{y=6} atop {x=2}} right. \\Otvet:; ; (2,6); .$

Answer 2

чтобы получить х=2, надо у=6 подставить в х=2у-10.