The slope of the line is given as m = rise/run = blue line / red line = -3/4.
What is the slope of a line?
the slope can be defined as the ratio of the rise of a line to the run of the line, and can be calculated as:
Slope (m) = change in y / change in x = rise/run.
In the image given below, we have drawn the line representing the run which is the red line and the blue line which represents the rise of the line.
The blue line 3 units
The red line is the run = 4 units
Slope (m) = - 3 units / 4 units = -3/4.