State the practical meaning of the slope and y-intercept for the situation described.The cost, in dollars, of cellular phone service with Econo-phone is given by C = 0.18x + 14.55, where x is the number of minutes used in one month.
Answer
A
0.18 signifies the cost per minute, and 14.55 signifies the monthly service charge.
B
0.18 signifies the hourly phone rent, and 14.55 signifies the cost of the hardware.
C
14.55 signifies the cost per minute, and 0.18 signifies the monthly service charge.
D
14.55 signifies the total phone bill, and 0.18 signifies the number of minutes used.
Explanation
In C = 0.18x + 14.55, the slope 0.18 is the amount the cost increases for each additional minute, so it represents the cost per minute. The y-intercept 14.55 is the cost when no minutes are used, so it represents the monthly service charge. Therefore, choice A is correct.
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