Find the ratio in which the point (2,y) divides the line segment joining the points A (-2, 2) and B ( 3, 7). Also, find the value of y.
Here, given points are A (-2, 2) and B ( 3, 7) and let the point dividing the line joining two points be C(2,y).
Let the ratio be m:n
By section formula,
x = , y =
For point C(2,y),
2 = …(1)
And y = …(2)
Solving 1 for finding ratio between m and n,
2 =
2(m + n) = 3m -2n
2m + 2n = 3m – 2n
∴ m = 4n
∴ =
∴ m : n = 4 : 1
Now solving for equation 2, where m = 4 and n = 1
y =
y =
∴ y =
∴ y =
∴ y =6
Hence, our point is (2, 6)