Is the table a linear function or nonlinear function?

Question

x: -2, -1, 0, 1, 2
y: 16, 20, 24, 28, 32

A: Linear
B: Nonlinear

Answer 1

Linear means there is a 1 to 1 correspondence.
Linear also means that if you were to graph it, it would be a straight line : )

Answer 2

note that at each step, x changes by the same amount: 1
Since y also changes by the same amount at each step, the function is linear. Since y changes by 4 when x changes by 1, the slope of the line is 4.