Answer:
1. Linear
2. Nonlinear
3. Linear
4. Linear
5. Nonlinear
Explanation:
Thies equation are in the form y=mx+b. Where m is the slope and b is the y-intercept. To solve them you neeed to see the power x is taken to. If the power on x is bigger than 1 than one, then it will curve at some point. This makes 2 and 5 nonlinear