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Edexcel P3 vectors
a = 6i + 8j
b = 3/2a
c = 6i + 3j
d = 5/3 c
asks for the vector equations of lines AD and BC and the position vector of their point of intersection...
i just dont know how to do it? help please...
b = 3/2a
c = 6i + 3j
d = 5/3 c
asks for the vector equations of lines AD and BC and the position vector of their point of intersection...
i just dont know how to do it? help please...
nacero2000
a = 6i + 8j
b = 3/2a
c = 6i + 3j
d = 5/3 c
asks for the vector equations of lines AD and BC and the position vector of their point of intersection...
i just dont know how to do it? help please...
b = 3/2a
c = 6i + 3j
d = 5/3 c
asks for the vector equations of lines AD and BC and the position vector of their point of intersection...
i just dont know how to do it? help please...
We can write the vectors as:
a=6i+8j+0k
b=9i+12j+0k
c=6i+3j+0k
d=10i+5j+0k
AD has equation r=A+t(D-A)=6i+8j+0k+t(4i-3j+0k)
BC has equation r=B+lamda(C-B)=.....
You can find the point of intersection by rewriting the lines in the form r=i[....]+j[....]+k[....] and equating the i,j and k components, solving to find lamda and t and hence finding the point of intersection.
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