课程咨询
美国本科留学资料领取

扫码添加助教

免费领取

备考资料大礼包

扫码关注公众号

2018年SAT考试数学备考练习题(19)

2018-04-02 17:44:00来源:网络

  新东方在线SAT频道为大家带来2018年SAT考试数学备考练习题,希望对大家SAT备考有所帮助。更多精彩尽请关注新东方在线SAT频道!

  Read the following SAT test question and then click on a button to select your answer.

  y=x+a

  y=-x+a

  In the system of equations above, a is a positive constant. If the system is graphed in the xy-plane, which of the following best describes the two lines?

  A.Both equations represent the same line.

  B.The lines are parallel.

  C.The lines are perpendicular.

  D.The lines intersect but are not perpendicular.

  【答案解析】

  答案:C

  解析:

  Let's examine the slope and y-intercept of both graphs.

  Both equations are written in slope-intercept form: y=mx+b

  where m is the graph's slope and b is the graph's y-intercept.

  The graph of the first equation, y=x+a, has a slope of 1 and its y-intercept is a.

  The graph of the second equation, y=-x+a, has a slope of -1. Its y-intercept is also a. Therefore, the y-intercepts are the same; the slope of the first equation's graph is the negative of the reciprocal of the slope of the second equation's graph (the reciprocal of 1/1 is 1/1), which means that the lines are perpendicular.

  以上就是新东方在线SAT频道为你带来的2018年SAT考试数学备考练习题,更多精彩敬请关注新东方在线SAT频道。

SAT水平能力测试【0元免费测试】

本文关键字: SAT备考数学 SAT数学 2018SAT

美本留学资料大礼包

微信扫描二维码 回复【美本资料】

机考SATCB官方样题|可汗练习题|AP全科大纲/备考资料包

更多资料
更多>>
更多内容

添加美本助教号

自动领取备考资料大礼包

1. 打开手机微信【扫一扫】,识别上方二维码;
2.添加【美本助教】,自动领取留学备考资料大礼包。

可汗学院新SAT题目完整版

微信扫描下方二维码 即可获取

更多>>
更多公开课>>

2023美本留学资料免费领取

微信添加美本助教

新东方美本助教
更多>>
更多资料

添加新东方在线美本助教号

自动领取备考资料大礼包

1. 打开手机微信【扫一扫】,识别上方二维码;
2.添加【Ella助教】,自动领取留学备考资料大礼包。