Question

{x+y=7
{x-y=3



Очень срочно 10 балов​

Answer 1

$\displaystyle \left \{ {{x+y=7} \atop {x-y=3}} \right. \\\\\left \{ {{x+y=7} \atop {x=3+y}} \right. \\\\3+y+y=7\\y=2\\x=3+2\\x=5\\(x,y)=(5,2)$