Question

2x+3y=30 2x-y=6 qual e a resposta

Answer 1

2x+3y=30
2x-y=6 (*3)

2x+3y=30
6x-3y=18

8x=48
x=48/8
x=6

logo 2.6+3y=30 ---> 12+3y=30 ---->3y=18 -----> y=18/3 ---->y=6

x=6 e y=6

Answer 2

2x+3y=30 2x-y=6---->(isolada)2x-y=6~~>y=6-2x ~~>2x+3y=30~~>2x+3.(6-2x)=30~~>2x+18-6x=30~~>2x-6x=30-18~~>-4x =12 y=12 dividido por 4 y=3 volta na isolada 6-2.(-3)~~> 6+6=12 x=3 y=12