I was given a multiple choice practice question by my lecturer on finding a vector orthogonal to two given lines. I do understand that I have to use the cross product to do this. I was initially given these two lines represented as parametric equations.
I have been given the answer which is: $-5i-11j-7k$
However, I do not know how to reach this answer. I have attempted to let t=0 and then cross-product the values which gave me $-5i+3j+10k$ where all three values were present somewhere in one of the given 4 choices, however, I could not reach the actual answer.