Question

Resolva o sistema a seguir:

2x - y = 24
x + y = 30

Answer 1

2x - y = 24

x + y = 30

x=30-y

2(30-y) - y = 24

60-2y-y=24

60-3y=24

-3y=24-60

-3y=-36 .(-1)

3y=36

y=36/3

y=12

x+12=30

x=30-12

x=18