SOLUTION: when making a phone call using a calling card a call lasting 6 minutes cost $1.60. a call lasting 13 minutes cost $3.00. Y=cost and X=minutes. Write a linear equation. predict h

Algebra ->  Linear-equations -> SOLUTION: when making a phone call using a calling card a call lasting 6 minutes cost $1.60. a call lasting 13 minutes cost $3.00. Y=cost and X=minutes. Write a linear equation. predict h      Log On


   

Question 745680: when making a phone call using a calling card a call lasting 6 minutes cost $1.60. a call lasting 13 minutes cost $3.00. Y=cost and X=minutes. Write a linear equation.
predict how much a 25 minute call cost?
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
X%5B1%5D=1.60
Y%5B1%5D=6
X%5B2%5D=13
Y%5B2%5D=3.00


so using the first pair (6,1.6)

we'll write:

Y-1.6=0.2(X-6)

so a 25 minute call will cost...
Y=1.60%2B.2%2825-6%29=1.60%2B.2%2A19=5.4
$5.40