Test the points in each option to determine which one fits the data.
Start by testing the first point, x = 1 and y = 3.
A. 3 =? 2(1)
3 ≠ 2 , so option A is out.
B. 3 =? 4(12)
3 ≠ 4 , so option B is out.
C. 3 =? 2(12) + 1
3 = 3 , so option C goes to the next round.
D . 3 =? 3(12)
3 = 3 , so option D goes to the next round.
Test the second point, x=2 and y = 12.
C. 12 =? 2(22) + 1
12 ≠ 9 , so option C is out.
D. 12 =? 3(22)
12 = 12 , option D goes to the next round.
Option D is the only remaining choice. Quickly test the other points for D:
27 =? 3(32)
27 = 27
48 =? 3(42)
48 = 48
y = 3x2 fits all the data.
f(x) = 3x2