Answer:

Explanation:
The slope of a line can be calculated with the following formula:

As you can notice, the slope of a line can be obtained by dividing the difference of the y-coordinates of any two points on a line by the difference of their x-coordinates.
Then, you must chosse two points on the given line. You can choose the following points:

Now you can say that:

Therefore, substituting those coordinates into the formula and evaluating, you get that the slope of the line shown in the picture is the following:
