PP3-I Q14

由 **william0904** » 2008-02-01 11:08

14. If ιand k are lines in the xy-plane, is the product of the slopes of t and k equal to -1

(1) Link ι passes through the origin and the point (1,2)
(2) Link k has x-intercept 4 and y-intercept 2

Ans:C

HELP!!!!!!

由 **Huang Hsin-Yi** » 2008-02-01 18:19

slope=Y0-Y1/X0-X1

因此線段任兩點便可算出斜率
(1) Line (0,0)(1,2)
(2)LineK(4,0)(2,0)

由 **william0904** » 2008-02-02 20:17

樓上大
照這樣的話豈不是單獨都解的出來嗎？

由小花 » 2008-02-22 17:26

知道斜率但不知兩線協率相成是否為－１
故ｃ　才充份

由 **max999** » 2008-02-22 20:52

請問一下PP3 是 PREP 嗎? :oo

PP3-I Q14

PP3-I Q14

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