Find the value of `lambda` so that the points (1, -5), (-4, 5) and `(lambda,\ 7)` are collinear.

Explanation

We have given `(1,
-5), (-4, 5)` and `(lambda, \7)`
are collinear.

Then we have to find `lambda`

Now any three points are collinear if the area of the triangle formed by these points will be zero.

As we know if `A(x_1, y_1),B(x_2, y_2)a n dC(x_3,y_3)`
are vertices of a triangle

Then the area of triangle are given as:

...