Question

Resolva:

{10x-8y=-14

{x+y=4

Answer 1

(10x-8y=-14
(x+y=4

(10x-8y=-14
(x+y=4   (8)

(10x-8y=-14
(8x+8y=32
O -8y com o 8y eu cortei

18x=18
x=18
----------
      18

x=1

agora o y

(10x-8y=-14
(x+y=4    (-10)

(10x-8y=-14
(-10x-10y=-40

eu cortei o 10 com -10
-18y=-54

y=-54
------------
    -18    

y=-54 :2
========
      -18 :2

y=-27
=======
     -9

y=3