i want to calculate x so these two vectors (198, 565,231)(-421, 123, x) are orthogonal to each other and then plot it in 3D. i want this to work with any random numbers where one of them is unknown.
This is what ive come up with so far:
k = Solve[{198, 565, 231}.{-421, 123, x} == 0]
Graphics3D[{Arrow[{{0, 0, 0}, {198, 565, 231}}], Arrow[{{0, 0, 0}, {-421, 123, k}}]}]
this gives me a value on k but for some reason the ploting doesnt work. Can someone please help me?
