Question

resolva os sistemas:

x-y=2
x+y=10

Answer 1

$\left \{ {{x-y=2} \atop {x+y=10}} \right. \ \rightarrow\ x = y+2\\\\ y+2+y = 10\\\\ 2y = 8\\\\ \boxed{y=4}\\\\ x-4 = 2\\\\ \boxed{x=6}\\\\\ \boxed{S(6,4)}$