1. Set A = {1, 8}
n(A)
Subsets:

Answer is A. Y=  -2x
I would just plug in the numbers for y and x
-12 = -2 (6)     True
-14 = -2 (7)     True
-16 = -2 (8)     True
-18 = -2 (9)     True
-20 = -2(10)    True
The rule Y= -12x can't be true since it would make all the Y values incredibly high. Also Y= -2x + 1 can't be true since that would mean -12 = -11 which is an incorrect statement.