8. The graph of the straight line that is represented by the equation 18x - 8y = 45 is:

Nope, First subtract 18x from both sides of the equation: -8y = 45 - 18x
Then divide both sides by -8:
  (-8/-8)y = {45/(-8)} -{18x/(-8)} =
  y = -5.625 - (-2.25x) =
  y = -5.625 + 2.25x (minus a minus same as plus a plus)
We end up with a line that has a positive slope and negative intercept. However, while choice b has a positive slope it also has a positive y-intercept.