Question

{x+y=9
{x-y=5
ME AJUDA AII

Answer 1

x+y=9
x-y=5
--------------
x+x +y-y =9+5
2x = 14
x=14/2
x = 7

x+y=9
7+y=9
y=9-7
y=2 

PROVA:

x+y=9
7+2=9
9=9 ok

x-y=5
7-2 = 5
5=5 ok