In this case, we'll have to carry out several steps to find the solution.
Step 01:
Data
Table
x y
2 0
1 9
4 18
7 27
10 36
linear function = ?
Step 02:
linear function
y = k x
point1:
( 2 , 0)
0 = k * 2
0/2 = k
0 = k ===> k 1 = 0
point2:
(1 , 9)
9 = k * 1
9/1 = k
9 = k =
k 1 ≠ k2
0 ≠ 9
The answer is:
The function is not linear