In the table below, x represents miles traveled and y represents the cost to travel by train. Miles, xCost, y28.50515.25822.001231.00What is the y-intercept of this function?

The cost increases by $6.75 when the miles increase by 3, so the rate is $2.25 per mile. Using the point (2, $8.50), subtract the cost of 2 miles: $8.50 − 2($2.25) = $4.00. Therefore, the y-intercept is $4.00, choice B.

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