Mr. G, how do I find the vector equation of a line that passes through the point (1, 3, 5) and is perpendicular to the plane -7y - 42z + 56 = 0 ?

In the textbook, they divided the direction vector by -7 so would you want us to put it in lowest terms on the exam?

That would certainly be nice, as it makes the answer look better, but it's not necessary. That is, you'd receive full marks either way.