Question

resolver o sistema {x+2y=50 2x-2y=10

Answer 1

x+2y=50
2x-2y=10
---------------
3x. =60
x=60/3
x=20

x+2y=50 ---> 20+2y=50
2y=50-20
y=30/2
y=15

Answer 2

resolução!

x + 2y = 50

2x - 2y = 10

3x = 60

x = 60/3

x = 20

2y = 50 - x

2y = 50 - 20

y = 30/2

y = 15

S = { x = 20 e y = 15 }