SOLUTION: Diane knows a phone call to a friend costs .25 for the first three minutes and .10 for each additional minute. Let y be the cost of a call that lasts x minutes. Write the slope a

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Diane knows a phone call to a friend costs .25 for the first three minutes and .10 for each additional minute. Let y be the cost of a call that lasts x minutes. Write the slope a      Log On


   

Question 253822: Diane knows a phone call to a friend costs .25 for the first three minutes and .10 for each additional minute. Let y be the cost of a call that lasts x minutes. Write the slope and an equation relating x and y. Thank you!
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!

y=.10(x-3)+.25
y=.10x-.3+25
y=.10x+24.7
slope =.10 or 1/10