Solution :
Since PS is the median, so S is the mid point of triangle PQR.
So, Coordinates of S = (\({7+6\over 2}, {3 – 1\over 2}\)) = (\(13\over 2\), 1)
Slope of line PS = (1 – 2)/(13/2 – 2) = \(-2\over 9\)
Required equation passes through (1, -1) is
y + 1 = \(-2\over 9\)(x – 1)
\(\implies\) 2x + 9y + 7 = 0
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