如果A(4,2) B(3,1) 那這樣直線AB的斜率是多少呢 我都是看左到右 卻沒看過右到左的斜率@@?

2016-08-01 3:36 pm

回答 (3)

2016-08-01 6:07 pm
✔ 最佳答案
以M表示斜率
從A點(4,2) B點(3,1)來看,4>3、2>1,可判斷M>0,為一右高左低的斜直線。
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M=△Y÷△X=(1-2)÷(3-4)=(-1)÷(-1)=1 ···從左到右
M=△Y÷△X=(2-1)÷(4-3)=(1)÷(1)=1 ··········從右到左
2016-08-02 4:26 am
m=(2-1)/(4-3)
m=1
2016-08-01 4:02 pm
斜率都是由左到右,直線斜率為1


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