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question mark

a)) show that the distance d between the parallel lines Ax+By+C1=0 and Ax+By+C2=0 in the plane is :

d=l C1 - C2 l/\sqrt{\A^2 + B^2

b)) use this result to find the distance between the parallel lines 2x+3y+17=0 and 4x+6y+31=0

ilham rafie , 14 Years ago
Grade
anser 4 Answers
dvm srikant

Last Activity: 14 Years ago

see here the lines are 

 Ax+By+C1=0 say it is  (L 1}  and 

Ax+By+C2=0   say it is {L2}  CONSIDER A POINT P{X1,X2} ON L2 AND            

SUBSTITUTING THE POINT IN L2 WE GET  WE GET {Ax1+Bx2+c2=0}

we get 

Ax1+Bx2=-c2 {minus c2} =1

distance between parallel lines=perpendicular distance from p to (L1)  from 1

Ax+By+C1/root over a2+b2=c1-c2/root over a2=b2 

B}

distance between the parallel lines 2x+3y+17=0  and 4x+6y+31=0 =a are multiply by 2 on both sides the equation 

2x+3y+17=0 we get 4x+6y+34=0 =b from a and b we get 34-31/root over 4square+6square we get

3/

\sqrt{\ } \!\,52


 

A



 

 

    




=



dvm srikant

Last Activity: 14 Years ago

pls approve

ilham rafie

Last Activity: 14 Years ago

Where is the answer???????????

shubhra pathak

Last Activity: 14 Years ago

b)) your answer is-   3/2√13

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