Question

What is the slope of a line perpendicular to the line `3x - y = 8`?

Answer 1

I would write your line in the form `y=mx+c`, where `m` is the slope, as:
`y=3x-8`
So your line has slope `m=3`
The line perpendicular to this one will have slope `m_1=-1/m=-1/3`