Question

Resolva R:2x+y=0 e s: x+4y-14=0

Answer 1

2x + y = 0
x + 4y - 14 = 0

2x + y = 0
x + 4y = 14   (-2)

2x + y = 0
- 2x - 8y = - 28  (+)
-------------------------------
 - 7y = - 28  (-1)
 7y = 28
y = 28/7
y = 4

2x + y = 0
2x + 4 = 0
2x = - 4
x = - 4/2
x = - 2