Question

which number is farther from 0 on a number line -9 or 6

Answer 1

If you are looking at a number line

-9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
  
-9 is clearly farther away from zero

Answer 2

-9

-9 -8 -7 -6 -5 -4 -3 -2 -1 ~0~ 1 2 3 4 5 6