Question

equacao de 1greu x-3y=5 2x+4y=0

Answer 1

{x-3y=5
{2x+4y=0

x=5+3y

2 (5+3y)+4y=0
10+6y+4y=0
6y+4y=0+10
10y=10
y=10
10
y=1

x=5+3y
x=1-5 S=(y=1 e x=-4)
x=-4