Would the answer be
2x+12

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

saving = more money

step-by-step explanation:

if you have 100 bucks, and you want to buy a candy bar, even if you have one at home, if you choose not to buy it, you save.

~courtney

irrational, cannot

i believe that the answer is

b. y-1=-2(x-4)

hope this !