When Ina started work, she was given two paid days of vacation. For each four-month period she stays at the job, her vacation is increased by one day. Let x represent the number of 4-month periods worked and y represent the total number of vacation days. Write an equation that models the relationship between these variables. How much vacation time will she have after working for 6.5 years?
a) ( y = 2 + x/4 ); 20 days
b) ( y = 2x + 1/2 ); 29 days
c) ( y = 2 + x/4 ); 26 days
d) ( y = 2x + 1 ); 26 days