Answer
$v_1$ and $v_4$
Work Step by Step
If a vector $v$ can be obtained by multiplying a vector $w$ by a constant, then $v$ and $w$ are parallel. If the dot product of two vectors is $0$ then they are orthogonal.
$\frac{5}{2}(4i+6j)=10i+15j$, hence $v_1$ and $v_4$ are parallel.