Question

Genteee por favor me ajuda nessa questao 3x+6y=84x + y= 13

Answer 1

3x+6y=84x + y= 13

3x+6(13)=84x
78=84x-3x
81x=78
x=78/81
x=0,962962

Answer 2

3x + 6 y = 84x + y = 13

3x + 6 (13) = 84x

3x + 78 = 84x

3x - 84x = - 78

- 81 x = - 78 ...(-1)

81x = 78

x = 78/81