FP3 Vectors, cartesian plane Watch
a) show the cartesian equation of is
Can anyone explain where the 5 comes from? chances are i'll get stuck on the rest of the question after this, but for now i just don't know where the 5 comes from.
I think that's a typo. I remember changing one of my question papers last week when someone spotted a type and this seems to be it. The 2 should be a 5 in the original question I believe.
The plane contains the line L and passes through Q,
c)find the equation of in the form
i get a is and b is but the answer scheme says c is which i don't understand =/
Thanks in advance.
You have to find two non-parallel vectors from a starting point, in this case 3i-2k. So, we know a line which lies on the plane (line L) as spotted. Now the next step is to use the other piece of information given. We know that Q lies on the plane. So how can you link Q in to get the second vector?
It would be just as valid to use wouldn't it? since the direction of the line doesn't matter, only that it's parallel.