The slope of a line
Given a line and two points through which it passes, say (x1,y1) and (x2,y2), the slope can be calculated as follows:
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]
Taking a look at the graphed line in the figure, we can detect two clear points in red dots: (-4,-4) and (-2,2).
Let's compute the slope:
[tex]m=\frac{2+4}{-2+4}=\frac{6}{2}=3[/tex]
The slope is m=3
