数据表现在包括有三个列，如图13所示。
The Data Table will now contain three columns, as shown in Figure 13.
沙滩书（格调轻松愉悦的休闲类书籍）也是一个因素，佛罗里达是唯一有3个城市被列在名单上的州，这三个城市是:迈阿密市，奥兰多市，还有佛罗里达大学所在地盖恩斯维尔市。
Beach books also may have been a factor. Florida was the only state with three cities on the list: Miami, Orlando and University of Florida's home, Gainesville.
那是x倍， 有2倍的x在第一个方程中， -1x, 没有x在第三个方程中， 这就是第一个矩阵的列。
That's x times, so there are 2 xs in the first equation, minus 1 xs, I'm just take no xs in the third, it's just the first column of that.
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