SAT数学每日练习题：一次函数的图像规律

　　今天课窝网继续为为广大备考SAT的人儿带来SAT数学每日一练，考察一次函数的图像规律，中等难度(正确率在56%左右)。配有答案详解，慢慢练习吧。

　　Each year from 2007 to 2015, a group of people were selected at random and surveyed about their use of online radio. The survey asked respondents whether or not they listened to online radio in the last month. The scatter plot shown gives the results of the survey, where P represents the percent of respondents who reported listening to online radio and t represents years since 2007. Which of the following equations best models the relationship between t and P?

　　A.P=0.23t+18

　　B.P=t+20

　　C.P=2.3t+20

　　D.P=4.3t+18

　　答案：D

　　解析：

　　Choice D is correct.

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