Answer:
3rd option, bottom left
3, 5, 7, 9
Step-by-step explanation:
In a linear function, every step in x has to have an equal step in y.
1.
9 to 8 = -1
8 to 5 = -3
5 to 0 = -5
The steps chance in size, so this cannot be a linear function.
2.
1 to 2 = 1
2 to 5 = 3
5 to 10 = 5
This is also not a linear function.
3.
3 to 5 = 2
5 to 7 = 2
7 to 9 = 2
This one could be a linear function.
4.
I already got the answer above and this one is clearly not linear so I won't write it out.
