Find $t$ if the given vectors are parallel:
$$OR = (t , t + 2)$$
$$OS = (3 , -4)$$
I easily understand the question if the vectors are perpendicular, because the dot product of perpendicular vectors is $0$, which means you can equate the vectors to $0$ and work it out that way, but I don't understand how to answer this question with parallel vectors! And it's very frustrating!
Is there a similar rule with parallel vectors that I am unaware of?
Also, my apologies for the rubbish formatting. I haven't got the hang of mathjax yet.