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

新SAT数学练习题附答案解析(71)

2018-05-28 16:43:00来源:新东方在线论坛

  新SAT数学练习题解析 

  o Answer: y + x = 5 can be written as y = -x + 5. The slope of this equation is m1 = -1.

  y - x = 5 can be written as y = x + 5. The slope of this equation is m2 = 1.

  m2 = -1/m1 so the 2 lines are perpendicular.

  We also need to find where the 2 lines intersect. If we add the 2 equations, 2·y = 10, y = 5.

  From the first equation, x = 5 - y = 5 - 5 = 0. In conclusion the lines intersect at (0, 5) and this point is on the y axis.

  In conclusion I and II statements are correct.

  o Answer: We have 4 possible integers for a and 3 for b, so the number of possible combinations for a/b is 4 · 3 = 12.

  a/b is an integer only for 4 combinations:

  1. a = 3 and b = 3

  2. a = 6 and b = 2

  3. a = 6 and b = 3

  4. a = 9 and b = 3

  The probability that a/b is an integer is 4/12 = 1/3 = .333.

 

新东方SAT备考资料免费下载

  以上就是新东方在线SAT频道为你带来的新SAT数学练习题附答案解析,更多精彩敬请关注新东方在线SAT道。

SAT水平能力测试【0元免费测试】

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。