Question #b7c26

2 Answers
Jul 4, 2016

Answer:

I would say: #y=0.3x+75#

Explanation:

Tou can write it as:
#y=0.3x+75#
where #y# represents the monthly cost considering the #x# minutes.

Jul 4, 2016

Answer:

#y = 0.3x -225#

Explanation:

The first thing is to find out how many minutes there are more than the first 1000 minutes. Find the difference:

Number of minutes in excess of 1000 = #x -1000#

For each of those minutes he will pay $0.30.

He also pays the monthly fee of $75.

The total cost #y# is:

#y = 75 + 0.3(x-1000)#

This simplifies to #y = 75+ 0.3x - 300#

#y = 0.3x -225#

Check: Assume he uses 1200 minutes
Cost = #75+ 0.3 xx 200 = 135#
or: #y= 0.3 xx 1200 - 225 = 135#