Question

Your phone plan charges you initial fee and then a certain amount depending on the amount of data you use they send you periodic updates of your usage and your current bill cost after using 3gb of data you owe $30after 5Gbof data you owe $40 what is the cost per gun of data

Answer 1

the cost per data would be 10 dollors

Answer 2

Answer: Cost per gb of data = y = $5.

Explanation:

Let the initial fee be 'x'.

Let the fees depending on the amount of data he use be 'y'.

After using 3 GB of data , he owes $30.

After using 5 GB of data , he owes $40.

According to question, our equations would be

`x+3y=\$30--------(1)\\\\x+5y=\$40------(2)`

So, Using elimination method , we get that

`x+3y=\$30\\\\x+5y=\$40\\\\----------------------------------------\\\\-2y=-10\\\\y=(10)/(2)\\\\y=\$5`

Hence, Cost per gb of data = y = $5.