Which two points are not on the graph 2x+3y-z-12=0 a.) (1, 1, 7) b.) (6, 0, 0) c.) (3, 3, 3

Plug all three answers in and see which one does not equal 0
A: 2(1)+3(1)-7-12≠0
B: 2(6)+0-0-12=0
C: 2(3)+3(3)-3-12=0

So A. I don't know why it says two (?) points?

Divide 40%5 and your answer is 8