The coordinates of points C, E, and H are; (-1.5, 8.5); (1.5, 7.5) and  (6, 6)
Each section of the line is 1.5 units higher along the x-axis direction and 0.5 units lower than Point A along the y-axis. Thus, for each section you have to add 1.5 to x-coordinates and subtract 0.5 from y-coordinate values.
Thus;
Point A has a coordinate of (-3, 9).
Point C is one section away from point A and as such the coordinates of section C is;
C = ((-3 + 1.5), (9 - 0.5))
C = (-1.5, 8.5)
Applying the same for points E and H are;
E(1.5, 7.5) and H(6, 6)
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