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2018年SAT考试数学备考练习题（22）

2018-04-05 17:44:00 来源：网络SAT资料下载

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!

-5.1x+3y=1.2

3.2x-8y=p

In the system of equations, p is a constant. Which of the following describes all values of p for which the system has exactly one solution?

A.p can be any number

B.p can be any number except 1.2

C.p can be any number except -1.2

D.p=1.2

【答案解析】

答案：A

解析：

Option A is correct. After rewriting the equations in slope-intercept form (y=mx+b), the slopes of the two equations are different and the constant p is part of the y-intercept. Since the slopes are different regardless of the value of p, the lines represented by the equations must always intersect at exactly one point. So there is always one solution for any value of p.

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