Question

Determine a linear function from the data in the table. Identify a point that is not part of the function.
x
​f(x)
0
180
1
174
2
168
3
162
4
156
Question content area bottom
Part 1
Which point is not part of the​ function?
A.
​(30,0)
B.
​(21,54)
C.
​(12,108)
D.
​(minus​15,270)
E.
​(9,120)

Answer 1

From the table the slope is f(x+1)−f(x)=174−180=−6, and f(0)=180, so f(x)=−6x+180.

Evaluate each:
- f(9)=−6(9)+180=126, not 120.

Thus the point not on the function is E. (9,120)