A long distance telephone company advertised the rates of 5 minutes for 85¢ and 10 minutes for $1.10.

Use a linear equation to find the cost of a 25 minute phone call.

Question

A long distance telephone company advertised the rates of 5 minutes for 85¢ and 10 minutes for $1.10.

Use a linear equation to find the cost of a 25 minute phone call.

texaschic101 · Answer

1.10 - .85 = .25
well....I am not sure how to write it .
5 min. for .85
10 min. for 1.10
15 min. for 1.35
20 min. for 1.60
25 min. for 1.85
It seems that 5 min. is .85 and every 5 minutes after that is .25 more.

mathstudent55 · Answer

You can use the given information as two points of a line.
(5, 0.85) and (10, 1.1)
Now you need to find the line through these two points.