Question

Resolva:

A) 2x-y=1
x+y=2
________

Answer 1

x + y = 2
x = 2 - y


2x - y = 1
2 . (2 - y) - y = 1
4 -2y -y = 1
-3y = 1 - 4
-3y = -3
y = 1 <------

x + y = 2
x + 1 = 2
x = 1 <-------

Answer 2

{2x - y = 1

{x + y = 2

• Método da Adição!

3x = 3

x= 3/3

x= 1

x + y = 2

1 + y = 2

y = 2 - 1

y= 1

S= ( 1 , 1)