Question

How do I identify the domain of `y=3 x+2`?

Answer 1

The domain is all real numbers. `D:{x:(x=R)}`

Domain is the set of all possible `x` values for a function. The function `y=3x+2` is a line graphed below:
graph{3x+2 [-10, 10, -5, 5]}

The line extends forever in both directions and is uninterrupted.