og 19 382题

crystal_10 · 发表于 2018-9-26 12:20:07

【OG19-382题】

Line £ lies in the xy-plane and does not pass through the origin. What is the slope of line £ ?

（1）The x-intercept of line £ is twice the y-intercept of line £.

（2）The x- and y-intercepts of line £ are both positive.

A

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C

BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D

EACH statement ALONE is sufficient.
E

Statements (1) and (2) TOGETHER are NOT sufficient.

正确答案是a
但是我觉得应该是c，因为截距不是指的绝对值吗？根据条件（1）只能得出k的绝对值等于1/2？

Melene · 发表于 2018-9-26 12:26:00

选A 截距不能等同于距离距离一定不为负但截距可正可负

cassiopeiazzy · 发表于 2018-9-26 13:32:41

截距可正可负，y=ax+b中，从来没说过b必须>0呀

[原始] og 19 382题