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Question

The ratio in which the line joining the points (3,4) & (5,6) is divided by x-axis.

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Solution

We know that if a line joining the points A(x1y1) and
B(x2,y2) is divided by a point O(x,y) in
the ratio m:n,
then x=mx2+nx1m+n

and

y=my2+ny1m+n

Hence A(3,4) & B(5,6) are points on a line which is divided by a point on x-axis, then the coordinates of the point will be C(x,0).

Since the point lies on x axis its y coordinate is 0

Let C divide live joining AB in the ratio k:1

0=(k×6+1×4k+1)

6k-4=0

6k=4

k=23

Hence the ratio in which x axis divide line joining points AB is 2:3

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