Question

Resolva o sistema
2X + Y = 10
X + 2Y = 18

Answer 1

Y= 10 - 2X

X + 2 ( 10 - 2X) = 18
X + 20 - 4X = 18
-4X + X = 18 - 20
-3X = -2 (-1)
X= 2/3

Y= 10 - 2 ( 2/3 )
Y= 10- 4/3
Y= 26/3


X= 2/3
Y= 26/3