Question

Determine o valor de x e y

4x+y=18
6x+y=38

Answer 1

y = 18 - 4x

6x + ( 18 - 4x ) = 38
6x + 18 - 4x = 38
6x - 4x = 38 - 18
2x = 20
x = 20 / 2
x = 10

y = 18 - ( 4 × 10 )
y = 18 - 40
y = - 22

4 × 10 + ( - 22 )
40 - 22 = 18

6 × 10 + ( - 22 ) =
60 - 22 = 38