GWD 1 Q34

[Karen]

Q34
In the xy-plane, what is the slope of line l?
(1) Line l dose not intersect the line with equation y = 1 - x.
(2) Line l intersects the line with equation y = x – 1.

ANS: A

thanks

[QQcandy]

As (1) indicate that Line l doesn't intersect the line with equation y=1-x, that's to say, Line l is parellel to the line w/equation y=1-x. Therefore, the slope of Line l is same as the line w/equation y=1-x.

Regarding (2), we only know Line l intersects the line with equation y=x-1 and don't know how they intersect....

so answer is "C"

Hope it's clear

[魚]

As (1) indicate that Line l doesn't intersect the line with equation y=1-x, that's to say, Line l is parellel to the line w/equation y=1-x. Therefore, the slope of Line l is same as the line w/equation y=1-x.

Regarding (2), we only know Line l intersects the line with equation y=x-1 and don't know how they intersect....

so answer is "C" <<=== VIVIAN 是 A 吧
Hope it's clear

........

VIVIAN姐姐 妳怕大家看帖不專心 ,對唄 :P

[QQcandy]

(H) 呵呵...還是魚美眉了解我....

[mcpopcorn2001]

不好意思

請再講解一下此題好嗎?

謝謝喔!

[Yimmiwan]

此題問L線的傾斜度(slope)
第一個條件是說L線不跟y=1-x這個程式的線相交,代表兩條線平行,所以L線的斜度跟y=1-x這條線一樣(就是1)
第二個條件是說L線跟y=1-x這個程式的線相交,但沒有說是如何相交(垂直,45度角等),所以無法得知L線的斜度

答案A