Is it a function?

A relation is a function if each input (x-value) has exactly one output (y-value).

The output is -5. (Calculation: y = -2(4) + 3 = -8 + 3 = -5)

Domain.

No, because the input 1 has two different outputs (5 and 7).

Range.

A function is a relation where each input has exactly one output.

A method to determine if a relation is a function; if a vertical line intersects the graph more than once, it is not a function.

A one-to-one relation means that each input has a unique output and each output corresponds to a unique input.

y = 4. (Calculation: y = 3(2) - 2 = 6 - 2 = 4)

The range is all non-negative real numbers (y ≥ 0).