[問題]GWD-6-36

由 **Grace** » 2004-12-20 11:05

Q36:
In the xy-plane, line l and line k intersect at the point (16/5, 12/5). What is the slope of line l?
(1)The product of the slopes of line l and line k is –1.
(2)Line k passes through the origin.

Ans: C

請教這題解題思路...感謝..[/quote]

由 **Jessy** » 2004-12-20 11:34

Grace \$m[1]:Q36:
In the xy-plane, line l and line k intersect at the point (16/5, 12/5). What is the slope of line l?
(1)The product of the slopes of line l and line k is –1.
(2)Line k passes through the origin.

Ans: C

請教這題解題思路...感謝..

[/quote]

這一題不必動手算

一條線知道兩個點就可以算出方程式
所以,當K知道通過(16/5,12/5)和(0,0)兩點,就可以算K線方程式
又兩斜率的乘積等於-1
就可以知道L的斜率囉!!

由 **Grace** » 2004-12-20 17:58

謝謝Jessy...我懂了..... :P
感恩...

由 **chris8888** » 2007-11-14 12:10

yeah,

兩線相交是垂直的, 斜率相乘等於-1, 他只在考這概念而已

[問題]GWD-6-36

[問題]GWD-6-36

Re: [問題]GWD-6-36

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