Choose all of the following which lie on the graph of x + 2y - z = 8. a) (5, 2, 13) b) (1, 2, 0) c) (6, -2, -6) d) (-3, -1, -8)

As an example, let's look at B:  x=1, y=2, z=0.

Evaluating the left side of the given expression in x, y and z, we get

x + 2y - z = 8  =>  1 + 2(2) - 0 = 5, which does not equal  8.  So B is not a solution.  

Please check out the other possible solutions. Which set {x, y, z} makes the given equation true?

Ithink ghe answer to this question is b just trying to others