1. Calculating Slope

2. Slope
Slope of a line is the measure of how up or down a line is pointing
Slope = (y2-y1)
(x2-x1)
= rise
run
Y axis
(x2,y2)
Rise
(X1, y1)
Run
X Axis

3. Points represented by (x,y) We choose (4,3) and (2,1)
To calculate slope, choose any 2 points on the line of best fit and subtract
Points represented by (x,y)
We choose (4,3) and (2,1) y 5 4
(4,3) 3 2 1
(2,1) x 1 2 3 4 5

4. Slope = (y2-y1)
(x2-x1)
= (3-1)
(4 -2)
= 2 2
= 1
Therefore the slope of the line is 1.

5. Calculating Slope by Mass/Volume Graph
Several samples of an object can be used to get a good measure of density.
Given a chart:
Choose your increments for each axis and plot your points.
Draw a line of best fit
Volume (x axis)
Mass (y axis)
3mL 1g
12mL 4g
15mL 5g
21mL 7g

6. Density graph has a line of best fit through the origin (zero).
Calculate the slope – choose any 2 points on the line
We choose ( ) & ( )
Slope = ( - ) =
( - ) =
Slope of mass-volume graph = DENSITY!
Therefore density of object = g/mL
Mass(g)
Volume (mL)