Answer:
For j = k^2 + 1 --> non linear b/c it has an exponent and is not increasing at a constant rate. The graph shown in the same question is linear b/c increasing at a constant rate and has a constant slope. For the y = 3x + 1 --> Linear b/c has a constant slope of 3/1 and the table 3. --> Non-Linear b/c doesn't have a constant slope.
Explanation:
Given above!