Question

A soma dos valores x e y é:
5x+y=3
x-y=-1

Answer 1

A soma dos valores x e y é:
5x + y=3
x - y= - 1(+)
-----------------
6x = 2
x = 2/6 (:2)/(:2)
x = 1/3

x - y = - 1
1/3 - y = - 1
1/3 + 1 = y
y = 1 + 1/3
y = 3/3 + 1/3
y = 4/3

(1+3)/3 = 3y/3
4 = 3y
3y = 4
y = 4/3

= x + y
= 1/3 + 4/3
= 5/3

R.: 5/3