(1) The product of the x-intercepts of line l and k is positive.
(2) The product of the y-intercepts of line l and k is negative.
ANS:C
嗚 截距是我的罩門
請高手指教一下 屑屑
[問題] 新GMATPrep PP2-9 DS
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[問題] 新GMATPrep PP2-9 DS
由 enim » 2005-12-20 16:49
In the xy-coordinate plane, line l and line k intersect at the point (4,3). Is the product of their slopes negative?
(1) The product of the x-intercepts of line l and k is positive.
(2) The product of the y-intercepts of line l and k is negative.
ANS:C
嗚 截距是我的罩門
請高手指教一下 屑屑
(1) The product of the x-intercepts of line l and k is positive.
(2) The product of the y-intercepts of line l and k is negative.
ANS:C
嗚 截距是我的罩門
請高手指教一下 屑屑
★Look for the clear light of truth.
∼Look for unknown new roads even when men's sight is keener far from now.
☆Divine wonder will never fail us.
★Every age has its own dream.
∼Leave then the dreams of yesterday.
☆You take the torch of knowledge and build the palace of the future.．．．．Madame Curie
∼Look for unknown new roads even when men's sight is keener far from now.
☆Divine wonder will never fail us.
★Every age has its own dream.
∼Leave then the dreams of yesterday.
☆You take the torch of knowledge and build the palace of the future.．．．．Madame Curie
-
enim - 中級會員
- 文章: 245
- 註冊時間: 2005-03-25 09:28
- 來自: Taiwan
由 enim » 2005-12-21 11:17
and this question~~help~~tks
★Look for the clear light of truth.
∼Look for unknown new roads even when men's sight is keener far from now.
☆Divine wonder will never fail us.
★Every age has its own dream.
∼Leave then the dreams of yesterday.
☆You take the torch of knowledge and build the palace of the future.．．．．Madame Curie
∼Look for unknown new roads even when men's sight is keener far from now.
☆Divine wonder will never fail us.
★Every age has its own dream.
∼Leave then the dreams of yesterday.
☆You take the torch of knowledge and build the palace of the future.．．．．Madame Curie
-
enim - 中級會員
- 文章: 245
- 註冊時間: 2005-03-25 09:28
- 來自: Taiwan
由 singingsong » 2006-10-09 21:38
這一題真的要研究一陣子
從第一個條件知道, 兩條線對x軸的交點都是正的值, 或都是負的值,但是仍然無法確定這兩條線的斜率.
從第二個條件,可以知道這兩條線對y軸的交點,一條的交點為正,一條的交點為負,但是仍無法確定這兩條線的斜率.
將兩個條件合併起來看,可以知道兩條線的斜率必是一正一負,所以可以確定兩條線斜率的乘績為負值.
從第一個條件知道, 兩條線對x軸的交點都是正的值, 或都是負的值,但是仍然無法確定這兩條線的斜率.
從第二個條件,可以知道這兩條線對y軸的交點,一條的交點為正,一條的交點為負,但是仍無法確定這兩條線的斜率.
將兩個條件合併起來看,可以知道兩條線的斜率必是一正一負,所以可以確定兩條線斜率的乘績為負值.
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singingsong - 新手會員
- 文章: 17
- 註冊時間: 2005-10-28 16:36
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