Find Gradient and Angle from 2 Data points.

Find Gradient and Angle from 2 Data Co-ordinates.

Trying to find the gradient and then the angle.

The program will open a text file and the program will do its stuff.

The text file will be like: I have 2 co-ordinates (X, Y) just contain numbers.

4 5
5 6

The formula.
m = (Y2 - Y1) / (X2 - X1)

Dont really know how to write the program to read the second column and line 1 take away second column line 2 to divide with first column line 1 take away first column line 2.

After figuring out the gradient.

|m| = square root of m^2

Thanks