Which of the vectors u1=(1,2), u2=(0,1), u3=(-2,-4), u4=(-2,1), u5=(2,4), u6=(-6,3) are
b. in the same direction?
c. in opposite directions?
a. u1 & u4, u1 & u6, u3 & u4, u3 & u6, u4 & u5, u5 & u6 because their dot products are 0
b. u1, u2 & u5 AND u4 & u6
c. u3 & u5
does anyone know if I did this right? did I miss anything?