Answer:
1. nonlinear
2. nonlinear
3. nonlinear
4. linear
5. linear
6. nonlinear
I think that is correct
Explanation:
There is two ways you can do it.
1st . See if it is being multiplied, x cannot be the denominator, y cannot have a exponent and the x cannot be squared.
2nd - Use a graphing calculator and see if the line is straight, that is a linear equation and curved lines are nonlinear.