For this question, I already have the correct answer of t = 3. My question is, do we ignore because the number can only be 0 where lies on the -axis?
Q. If & & if is on the -axis, find the value of the scalar t.
Attempt:
Your error is that you shouldn't set equal to the zero vector (in fact this has no solutions). All you need to do is set the -component to zero so that lies on the j-axis.
We ignore the j-component, and obtain the equation