4.There is another website offering movies at a cost of $10 per DVD (including S&H). Follow the same steps as in #3 in analyzing the cost for DVD’s. Plot the data points, draw the line, and write an equation. Now compare the results with those in #3. a. How do the graphs differ?
b. How many movies would you have to rent for the price to be exactly the same both sides?
c. What would be the price difference if you bought a dozen movies at each site?

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

ιт ιѕ 6 6/23

step-by-step explanation:

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