1. Is it proportional?
We will look at some equations, graphs and tables and you will decide if the relationship is proportional.
Tell why or why not.
If it is proportional, state what the constant of proportionality is.

2. Is it proportional? 1) 1 2 3 10 6 12 18 60

3. Is it proportional? 2)

4. Is it proportional? 3) 2 3 4 5 8 11 14 17

5. Make a table of values to check
Is it proportional? 4)
c = 50d + 25
Make a table of values to check 1 2 3 4

6. Is it proportional? 5) 5 8 10 14 21 16 20 28 42

7. Is it proportional? 6) 4 3 2 1 1 2 3 4 5 6

8. Make a table of values to check
Is it proportional? 7)
c = 6d
Make a table of values to check 1 2 3 4

9. Proportional Relationships:
Must have a constant rate of change (linear).
Graph goes through the origin. It starts at (0,0).
When one variable doubles, triples, halves, etc, the other variable does the same
When x = 0, y = 0
Nothing added or subtracted in the equation
All ratios are equal.
If you make the ratio 𝑦 𝑥 for any pair of variables, you get a constant rate (which is called the constant of proportionality).