Question

24. Resolva os sistemas c)
{-2x-6y=6
{x+7y=-3

Answer 1

-2x-6y=6

x+7y=-3

x+7y=-3

7y=-3-x

y=(-3-x)/7

-2x-6.(-3-x)/7=6

-2x+(18+6x)/7=6

-14x+18+6x=42

-14x+6x=42-18

-8x=24

x=24/-8

x=-3

-3+7y=-3

7y=-3+3

7y=0

y=0/7

y=0

Resposta: y=0 e x=-3