Question

calcular o valor de "X" , "Y" é "Z" no sistema:

cálculo pfvr

Answer 1

2x + y + z + (x - y - 2z ) = 8 + (-5)
3x - z = 3

4x + 2y + 2z + (x - 2y + z) = 16 + 3
5x + 3z = 19

$\left \{ {{3x - z=3} \atop {5x + 3z=19}} \right. \\ \\ 14x = 28 \\ x = 2 \\ \\ 3x - z = 3 \\ 3(2) - z = 3 \\ 6 - z = 3 \\ z = 6 - 3 \\ z = 3 \\ \\ \\ 2x + y + z = 8 \\ 2(2) + y + 3 = 8 \\ 4 + y + 3 = 8 \\ y + 7 = 8 \\ y = 1$