Question

Metodo de substituiçao
{3x + y = 4
{x - y = 2

Answer 1

olá boa noite

{3x + y = 4
{x - y = 2
-----------------'(+)

4x= 6

x=6/4=>3/2

3. 3/2+y=4

9/2+y=4

9+2y=8

2y=8-9

y= -1 / 2

s ( 3/2 , -1/2 )