I have tried solving this again and again but I get wrong answer.
Points A and B have coordinates (2,7) and (-3,-3) respectively. Use a vector method to find the coordinates of C and D, where
(a) C is the point such that AC = 3AB (AC and AB have that arrow for vector notation)
(b) D is the point such that AD = 3/5 AB ..
I only need (a) and I hopefully that will help me understand it.
Thanks
Dear struck,
mark the origo O in koordinates (0, 0)
So
OA = (2,7)
OB = (-3,-3)
AB = OB - OA = (-3-2, -3-7) = (-5,-10)
AC = 3*AB = (3*(-5),3*(-10)) = (-15,-30)
If the question is OC than
since AC = OC - OA --> OC = AC + OA = (-15+2,-30+7) = (-13,-23)
The point C is (-13,-23).