6400 bricks have been delivered by the first day of a bricklaying contract subsequently 1600 bricks are delivered daily.

bricklaying commences on the first day and proceeds regularly, the bricklayers use 2400 bricks per day.

write down 2 equations of the form y=mx+c the first in respect of brick delivery, the second of bricklaying.

use these equations to find out how many days after the commencement of contract the bricklayers will have run out of bricks

thanx

jim