Just a quickie... I think the sample test we were given for tomorrow's final has an error. Vector from point (2,1) to (-7,-1). Write in rectangular coordinate form. I get v = (-7-2)i + (-1-1)j = -9i - 2j Sample test answers are a) -9i b) 9i c) -9j d) 9j I don't think it's right... somebody confirm.
my brain hurts, its the 5th of may, time for taquilla not for vectors! (sorry to hear youve got a final, mines not till 1 fri)
If my vector addition is correct, they should have the j^ (j hat) direction as well... Odd, I would choose the -9i since it comes first regardless. Draw the vector, it should look correct. Within the plane of the i,j dimension, we know 9i should at least be in there...