Kelly saves $5 every week. which expression represents the amount of money, in dollars, kelly will save in w week

She saves $5 each week
that makes this the rate, it will constantly increase by $5 each month until she stops saving

So if the number of weeks is represented by w the expression that shows how much she saves in number of weeks is

y=5w

M = The amount of money she will save in [x] amount of weeks

W = The amount of weeks, she saves 5 dollars each week

5 = How much money she earns in a week

THE EQUATION - m = 5w

Documentation and time management