Nina M. answered • 06/09/19

Math, SAT/ACT science Tutor at all levels

The highest power of the independent variable, which is x in all 5 answers, is 1 for linear equations.

The highest power of x in

answer a is 2,

answer b is 1,

answer c is -1,

answer d id 3,

answer e is 1

Therefore, the a), c), d) are non linear.