Let's see how much it would cost for 8 batteries by each package
1) 3.92 x 2 = 7.84
the second package as it would be much cheaper
you ignore the remainder, therefore the answer is y = x+2
you have to divide the denominator by the numerator. you can use synthetic division or long division.
[-5] . 1 . 7 . 11
x + 2 + 1/x+5