P (-5,a),q (b,7),r (1,-3) these points are collinear. Then find the values of a and b?

P (-5,a),q (b,7),r (1,-3) these points are collinear. Then find the va

1.	P (-5,a),q (b,7),r (1,-3) these points are collinear. Then find the values of a and b?
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