What is the slope of the line?

The formula of a slope:
[tex]m=\dfrac{\Delta y}{\Delta x}[/tex]
Δy = 2
Δx = 1
Substitute:
[tex]m=\dfrac{2}{1}=2[/tex]
Other method.
The formula of a slope:
[tex]m=\dfrac{y_2-y_1}{x_2-x_1}[/tex]
Find two points.
(0, 1) and (1, 3). Substitute:
[tex]m=\dfrac{3-1}{1-0}=\dfrac{2}{1}=2[/tex]