.SAT 2010年1月的一道数学真题The scatterplot above shows airfares in relation to the flight distance,in miles,for the ten lowest-priced airfares from Baltimore.Based on the scatterplot,which of the following statements are true?I..II..III.The slope,in dollars per mile,of the line of best fit for the data is negative .没理解III 如果说要把每英里的价格求出来,那就只有一种变量,每办法组成一个y=kx+b的线 那还谈什么slope?
问题描述：
.SAT 2010年1月的一道数学真题
The scatterplot above shows airfares in relation to the flight distance,in miles,for the ten lowest-priced airfares from Baltimore.Based on the scatterplot,which of the following statements are true?
I..
II..
III.The slope,in dollars per mile,of the line of best fit for the data is negative .
没理解III 如果说要把每英里的价格求出来,那就只有一种变量,每办法组成一个y=kx+b的线 那还谈什么slope?
答