Question

resolva os sistemas a seguir:

x+y=45
x=2y

Answer 1

2Y + Y = 45

3Y = 45

Y = 15

X= 2.15

X= 30

Answer 2

x + y = 45
x = 2y
--------------
2y + y = 45
3y = 45
y = 15

x = 2y
x = 2. 15
x = 30