Question

resolva os sistemas:

x+2y=10
x=3y

Answer 1

 3Y + 2Y = 10

5Y = 10

Y= 2

X= 3.2
X=6

Answer 2

x+2y=10
x=3y

x+2y = 10  [-1]
x - 3y = 0

-x - 2y = -10
x - 3y = 0

0x -5y = -10
-5y = -10 [-1]
5y = 10
y = 10/5
y = 2

x + 2.2 = 10
x + 4  = 10
x = 10 - 4
x = 6