Question

x + y = 12x 2x + 3y =1 qual o valor de x e y

Answer 1

Resposta:

2x + y = 12

2 (3y-1)+y=12

6y+2+y=12

6y+y=12+2

7y =14

y=14/7

y=2

x=3y-1

x=3 (2)-1

x=6-1

x=5