Answer:

Explanation:
Let's call
the number of weeks.
Notice that the problem says "at least $535" this means the minimum is $535 or more, so we have to use the symbol
.
Also, you are gonna save $25 per week, which means this is the ratio of change, the coefficient of the variable.
Additionally, you already have $200, so that's the constant of the expression.
Therefore, the expression that models this situation is

We can solve for
to find the minimum number of weeks you need to save

So, you need to save for at least 14 weeks.