Solve. Assume the exercise describes a linear relationship.
When making a telephone call using a calling card, a call lasting 3 minutes costs $1.05. A call lasting 12 minutes costs $2.85. 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 making a call lasting x minutes.
a. y = -0.2x + 1.65
b. y = 0.2x - 9.15
c. y = 0.2x + 0.45
d. y = 5x - 279/20

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I got this
y = -0.2x + 1.65

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