SOLUTION: When making a telephone call using a calling card, a call lasting 6 minutes costs 1.65. A call lasting 16 minutes costs 3.65. Find a linear function that relates the cost of maki

Question 259627: When making a telephone call using a calling card, a call lasting 6 minutes costs 1.65. A call lasting 16 minutes costs 3.65. Find a linear function that relates the cost of making a call (C) to the length of the call (x).
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
The points are (6,1.65) and (16, 3.65)
Here we have x,c instead of x,y
c-c/x-x=m
3.65-1.65/16-6=m
2/10=1/5
c=1/5*x+b
1.65=1/5(6)+b
1.65=6/5+b
1.65*5/6=b
1.375=b
C=x/5+1.375

RELATED QUESTIONS
Solve. When making a telephone call using a calling card, a call lasting 5 minutes... (answered by mananth)

When making a telephone call using a calling card, a call lasting 6 minutes costs $2.90.... (answered by stanbon)

when making a telephone call using a calling card, a call lasting 6 minutes costa $2.75.... (answered by ewatrrr)

Solve. When making a telephone call using a calling card, a call lasting 5 minutes... (answered by ewatrrr)

When making a telephone call using a calling card, a call lasting 6 minutes cost $1.65. A (answered by jorel1380)

Hello, i have problem on a word problem for linear equation. hope you can help me... (answered by josmiceli)

Story prolem and need help. When making a telephone call using a calling card, a call... (answered by htmentor)

when making a phone call using a calling card a call lasting 6 minutes cost $1.60. a call (answered by tommyt3rd)

The cost "C" in cents of an internet telephone call lasting "m" minutes is a flat "x"... (answered by Theo)