Answer to Additional Practice:
Calculating the Slope
Calculate the slope of the line given in the figure below.
To calculate the slope of this line you need to:
- Step One:
Identify two points on the line.
Identify points C (10, 20) and D (40, 30) on the line.
- Step Two:
Select one to be (x1, y1)
and the other to be (x2, y2).
Let's take C (10, 20) to be (x1,
y1). Let's take the point D (40,
30) to be the point (x2, y2).
- Step Three:
Use the slope equation to calculate slope.
Using points C (10, 20) and D (40, 30) your calculations will
- If you did not use the points C and D to calculate the slope,
but the slope you calculated is still a fraction that is a little
different from our solution, you should check your selection
- If your slope was closer to 3, you probably inverted the
If you feel comfortable with this material, please move on
to the next section of this unit. If you still do not understand
how to calculate the slope of a straight line from its graph,
you may need more review than is offered by this booklet. If this
is the case, please speak with your professor for suggestions
on how to get help.