Linear or nonlinear? Tables

Find the rate of change between neighbouring columns. If it is always the same, the relationship is linear.

1. Is this relationship linear or nonlinear? x = 2, 5, 8, 11 and y = −5, −17, −29, −41. Write linear or nonlinear.
2. Is this relationship linear or nonlinear? x = −1, 0, 1, 2 and y = −9, −15, −21, −27. Write linear or nonlinear.
3. Is this relationship linear or nonlinear? x = −3, −2, −1, 0 and y = −8, −7, −4, 1. Write linear or nonlinear.
4. Is this relationship linear or nonlinear? x = 2, 4, 6, 8 and y = −5, 3, 11, 19. Write linear or nonlinear.
5. Is this relationship linear or nonlinear? x = −4, −1, 2, 5 and y = −3, −21, −39, −57. Write linear or nonlinear.
6. Is this relationship linear or nonlinear? x = 2, 4, 6, 8 and y = −8, −4, 0, 6. Write linear or nonlinear.
7. Is this relationship linear or nonlinear? x = 3, 6, 9, 12 and y = −1, −25, −49, −76. Write linear or nonlinear.
8. Is this relationship linear or nonlinear? x = 1, 3, 5, 7 and y = −9, 3, 15, 30. Write linear or nonlinear.
9. Is this relationship linear or nonlinear? x = −2, 1, 4, 7, 10 and y = −1, 23, 47, 71, 95. Write linear or nonlinear.
10. Is this relationship linear or nonlinear? x = 4, 5, 6, 7, 8 and y = 6, 16, 26, 36, 46. Write linear or nonlinear.
11. Is this relationship linear or nonlinear? x = −4, −2, 0, 2, 4 and y = −1, 3, 15, 35, 63. Write linear or nonlinear.
12. Is this relationship linear or nonlinear? x = 1, 2, 3, 4, 5 and y = −1, 0, 3, 8, 15. Write linear or nonlinear.
13. Is this relationship linear or nonlinear? x = −2, 0, 2, 4, 6 and y = 3, 15, 27, 39, 49. Write linear or nonlinear.
14. Is this relationship linear or nonlinear? x = 0, 3, 6, 9, 12 and y = 5, 14, 41, 86, 149. Write linear or nonlinear.
15. Is this relationship linear or nonlinear? x = 4, 5, 6, 7, 8 and y = 8, 1, −6, −13, −23. Write linear or nonlinear.
16. Is this relationship linear or nonlinear? x = 0, 1, 2, 3, 4 and y = 7, 6, 5, 4, 3. Write linear or nonlinear.
17. Is this relationship linear or nonlinear? x = 1, 3, 5, 7, 9, 11 and y = −6, −24, −42, −60, −78, −96. Write linear or nonlinear.
18. Is this relationship linear or nonlinear? x = 0, 2, 4, 6, 8, 10 and y = 5, 25, 45, 65, 85, 105. Write linear or nonlinear.
19. Is this relationship linear or nonlinear? x = 0, 2, 4, 6, 8, 10 and y = 8, 24, 40, 56, 72, 88. Write linear or nonlinear.
20. Is this relationship linear or nonlinear? x = 3, 6, 9, 12, 15, 18 and y = −7, 11, 29, 47, 65, 86. Write linear or nonlinear.