1. Graphing Data

2. Variables
Independent Variable: causes a change Dependent Variable: depends on independent Ex. Time is always independent…always changes Speed depends on the time  it’s dependent

3. X axis : Independent variable Y-axis: Dependent variable Slope: Rise/Run

4. Graph 1: Density of Magnesium
Y=mx+b
Slope is:
m =y2-y1= = 1.7
x2-x
Independent:
Volume
Dependent:
Mass
Observations: as the volume of the magnesium increased, the mass of magnesium also increased.

5. Graph 2: Boyle’s Law Independent: Pressure Dependent: Volume
Observations: as the pressure increased the volume of the gas decreased.

6. Conclusion: What are differences in graph 1 & 2
Graph 1: is a direct relationship Graph 2: is a opposite (inverse) relationship

7. Graph 1 is….. Directly Proportional
One variable goes up the other variable goes up and vice versa
Directly Proportional

8. Graph 2 is …. Inversely Proportional
One variable goes up the other variable goes down and vice versa
Inversely Proportional

9. Practice

10. Independent:
Time
Dependent:
Amount
As time progressed, the amount of cesium decreased
This is a inversely proportional graph

11. As temperature increases, the amount of solute in the water increases.
Independent:
Temperature
Dependent:
Solute/Solvent
As temperature increases, the amount of solute in
the water increases.
This is a directly proportional graph

12. As temperature increases, the volume of hydrogen gas increases.
Independent:
Temperature
Dependent:
Volume
As temperature increases, the volume of hydrogen gas
increases.
This is a directly proportional graph