Answer:
Let's define T(x) as the cost with the company Teen-Mobile, where x is the number of gigabytes used.
We have a constant fee of $15 plus extra $10 for each gigabyte used, then:
T(x) = $15 + $10*x
Let's define B(x), same as above, but for the company Bruh-rizon.
Here we have a constant of $30 plus $7 for each gigabyte used.
B(x) = $30 + $7*x
Where in each equation, the growth rate is the coefficient multiplicating the x (also called the slope) , and the other factor is the starting value (also called the y-intercept).
Now knowing the number of gigas that you use in a month, can decide which option is best for you.
I hope this picture helps you answer your question
24 3-pound bags(72 pounds) and 10 5-pound bags(50 pounds). 72+50 = 122 pounds, 24+10 bags = 34 bags.
