Find and interpret the slope of the line that goes through the given points. (1, 9) and (0,2)

select the correct choice below.

a. for every unit of increase in x, y will decrease by 7 units.
b. for every unit of increase in x, y will increase by 7 units.
c. for every 7 units of increase in x, y will decrease by 1 unit.
d. for every 7 units of increase in x, y will decrease by 1 unit.