The slope of the line in the graph is 50.
How to get the slope of the line?
If a line passes through two points (x₁, y₁) and (x₂, y₂), then the slope is:
a = (y₂ - y₁)/(x₂ - x₁)
Here we have the points (0. 50) and (1, 75). then the slope will be:
a = (75 - 25)/(1 - 0) = 50
The slope is 50.