Graph line with slope 1/2 passing through the point (-3.-1)

The equation of the line:
                                       y = m x + c
  m is the slope ,   c is constant
  so m = 1/2  (given)
so    y = (1/2) x + c

c will be calculated from the given point as y -1 when x =-3
then         -1 = (1/2) * -3 + c
                 c = -1 +(1/2)*3 = 1/2
so y = (1/2) x + (1/2)

the graph of function is as shown in the figure

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.