The ratio in which the line x + y + 1 = 0 divides the line segment joining (2, 1) and (–2, –1) is (taken in order)
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Let A(3,-1) and B(8,9).
Let the line x−y−2=0 divide the line segment AB at point C(x,y) in the ratio m:n.
By section formula,
C(x,y)=[m+nm×8+n×3,m+nm×9+n×−1]
C(x,y)=[m+n8m+3n,m+n9m−n]
Since, point C lie on the line x−y−2=0,
m+n8m+3n−m+n9m−n−2=0
8m+3n−9m+n−2m−2n=0
3m=2n
nm=3/2
Hence, the required ratio is 2:3.
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