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Determine Linearity and Slope from a Table

For each of the following functions, determine if the function is linear. If it is linear, give the slope. If it is not linear, enter $\displaystyle {D}{N}{E}$ for the slope.

x	1	2	8	9	11
f(x)	-2.5	-11	-60.5	-70.5	-87.5

Behavior:

Slope:

x	1	4	5	7	14
f(x)	14	5	2	-4	-25

Behavior:

Slope:

x	4	6	7	11	12
f(x)	36	54.5	63.75	100.75	110

Behavior:

Slope:

x	1	6	9	10	16
f(x)	-13	9	27	32	62

Behavior:

Slope:

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