For this case we have the following vectors:
u = (9, 0)
v = (0, -9)
Using product point we have:
u.v = (9, 0). (0, -9)
u.v = (9) * (0) + (0) * (- 9)
u.v = 0 + 0
u.v = 0
If the scalar product of two vectors is zero, both vectors are orthogonal.
Answer:
C. orthogonal
