Consider two paralles lines
L1:3x+4y-7=0
L2:3x+4y+8=0
(a0 Find the distance between L1 and L2
(b) a line L cuts L1 and L2 at P and Q respectiveu and PQ =3(x)^0.5
(i)Find the acute angle between PQ and L1
(ii)hence find the slope of the line L
(c)If L passes through the point (2,3) ,find the equation
Would you please give me the answer before 6 O'clocl?
Thank you
Amath questions
2008-11-23 11:56 pm
回答 (3)
2008-11-24 1:10 am
✔ 最佳答案
a) Take any pt on L1When X=0,
Y=7/4
(0,7/4)
[3(0)+4(7/4)+8]/[(3^2+4^2)^1/2]<--absolute
=8/5
b1)請問3(x)^0.5 係咩意思?
你畫左個圖出黎再用sin(acute angle)=distance between L1 and L2/PQ
b2)let slope of L be m
slope of L1=-3/4
tan(acute angle)= [m-(-3/4)]/ [1+(-3m/4)]
c) (y-3)=m(x-2)
參考: myself
2008-11-24 12:57 am
a:
d = | -15/5 |
= 3
b唔識做-_-
未教到呢課...
d = | -15/5 |
= 3
b唔識做-_-
未教到呢課...
2008-11-24 12:51 am
Is PQ a variable? Please clarify the length of PQ.
收錄日期: 2021-04-25 22:36:15
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