Suppose y - axis divides PQ in the ratio K:1 at R
Then, the coordinates of the point of division are:
Since, R lies on y - axis and x - coordinate of every point on y - axis is zero
Hence, the required ratio is 2/3:1
i.e., 2:3
Putting K=2/3 in the coordinates of R
We get, (0,1)
Let the point P divide AB in the ratio K:1
Then, the coordinates of P are
But the coordinates of P are given as (−5,−21/5)
Hence, the point P divides AB in the ratio 2/3:1 => 2:3