$184, assuming attendance of one course (not class).
Total cost for one year (x) = $100 + ($7/ month)x, where x is the number of months.
As there are 12 months in one year:
Total cost (12) = $100 + ($7/monthly)(12) = $184
x = number of months
7*x = 7 times the number of months
7*x = total cost if you ignore the $100 fee
7x+100 = total cost with the fee of $100 included
y = total cost
y = 7x+100
Final y = 7x+100
note: the slope is 7 and the y intercept is 100
all you do is count how many times you move