SOLUTION: When making a telephone call using a calling card, a call lasting 6 minutes cost $1.65. A call lasting 15 minutes cost $3.45. Let y be the cost of making a call lasting x minutes u

Question 1084632: When making a telephone call using a calling card, a call lasting 6 minutes cost $1.65. A call lasting 15 minutes cost $3.45. Let y be the cost of making a call lasting x minutes using a calling card. Write a linear equation that models the cost of a making a call lasting x minutes.
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
Let c be the fixed cost of making a call, and x be the variable cost, in minutes. Then:
c+6x=1.65
c+15x=3.45
So:
9x=1.80
x=.2
So
y=.2x+.45
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