Answer:
Lower right
Explanation:
In a linear function, you always add the same number to the y to get the next y. See in that table the first y is 7. Add 2 to get to 9. So to be linear, you need to add 2 to get each other y. So, 7, 9, 11, 13, that's how you know it's a linear function because you add 2 to get the next y term (the fancy term is a common difference, but the idea is simple!)