Slope of a line

The slope m of the line containing the points P (x0; y0) and Q(x1; y1) is:

m= (y1 - y0) / (x1 - x0)
provided x1 not equal x0.

Example:
 Find the slope of the line containing the following pairs of points, if it exists.
Plot each pair of points and the line containing them.

1. P(0 ; 0), Q(2 ; 4)
2. P(-1; 2), Q(3 ; 4)
3. P(-2 ; 3), Q(2 ; -3)
4. P(-3 ; 2), Q(4 ; 2)
5. P(2 ; 3), Q(2 ; -1)
6. P(2 ; 3), Q(2.1 ; -1)

Solution
In each of these examples, we apply the slope formula of the Equation above

Slope of a line - Solved Examples