Answer:
(0, 0), (2, -3)
Explanation:
The slope of -3/2 tells you the "rise" is -3 while the "run" is +2. That is, the difference in y-values (rise) will be -3 when the difference in x-values (run) is 2. You can scale these values any way you like, making them -3/5 and 2/5, for example, or 933 and -622.
Since the line is unspecified, you can also add any translation to these points that you might like.
A generic pair of points that fit the requirement is ...
(0, 0) and (2, -3)
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If we scale these by a factor of 2.1 and add a translation of (-5, 42), then the points could be ...
(-5, 42), (-0.8, 35.7) . . . . another pair of points on a line with slope -3/2