Question

X+y=5 x-y=2 resolva em U = R2

Answer 1

{x + y = 5
{x - y = 2

(corta o y)

{x = 5
{x = 2
———
2x = 7
*x = 7/2*

{x + y = 5
7/2 + y = 5
y = 5 - 7/2
y = 10 - 7/2
*y = 3/2*

Answer 2

x+y=5
x-y=2

2x=5+2

2x=7

x=7/2


y=5-x

y=5-7/2

y=10-7/2

y=3/2

espero ter ajudado!

bom dia !