Question

Resolver pelo método da substituição de -2x+4y=12 e x+4y=12

Answer 1

-2x + 4y = 12

x + 4y = 12  ---> 4y = 12 - x

                          y = 12/4 - x/4

                          y = 3 - x/4

-2x + 4 (3 - x/4) =12

-2x + 12 - x = 12

-3x = 12 - 12

x = 0

0 + 4y = 12

y = 12/4

y = 3