Answer:
The numbers:
1, -3, 2, -9, 3, -15, 4, -21,
are not linear.
Step-by-step explanation:
If it was linear:
4, 3, 2, 1, -3, -9, -15, -21
The first answer is 21x+22.
Second answer is 36+3x.
Third answer is 29x+6.
I just simplified