himpunan penyelesaian persamaan 2x - y = 1 y + 3 z = 6 adalah ( {x,y,z} ) 3x - z = 5 nilai x - z adalah

[tex]2x - y = 1 \\ y + 3z = 6\\3x - z = 5\\\\\text{samakan...}\\\text{y = y}\\\text{2x - 1 = 6 - 3z}\\\text{2x + 3z = 7}\\\\\text{samakan...}\\\text{3z = 3z}\\\text{7 - 2x = 9x - 15}\\\text{11x = 22}\\\text{x = 2}\\\\\text{Substitusi...}\\\text{2(2) - y = 1}\\\text{y = 3}\\\\\text{Substitusi...}\\\text{2x + 3z = 7}\\\text{2(2) + 3z = 7}\\\text{3z = 3}\\\text{z = 1}\\\\\text{maka nilai x - z adalah ...}\\\boxed{\boxed{\,\text{2 - 1 = 1}}}[/tex]