Question

Emmanuel has 745 pictures in his phone. His memory is getting full, so he starts deleting 20 pictures everyday. Define each variable and write an algebraic expression to describe the number of pictures left on his phone after any given number of days

Answer 1

I think the answer is
y=-20x+745

Answer 2

y=745-20x

y= the amount of photos left

x= days since he started deleting photos