If a and b are real numbers and if y = ax + b is a direct variation equation, what do you know about a and b?

y = ax + b
 We observe that the given equation is the generic equation of a line.
 Where,
 a = represents the slope of the line. That is, the rate of change of the given function. (in this case it is constant).
 b = is the cut point with the y axis.

The answers are 20,30,80,180,960,890,1230,4560. on the first row