Question

resolva os sistemas
2x+y=2 e 5x-y=1

Answer 1

{2x + y = 2
{5x - y = 1

•método da adição

2x + y + 5x - y = 2 + 1
7x = 3
x = 3/7

> 2. (3/7) + y = 2
6/7 + y = 2
y = 2 - 6/7
y = 8/7