Sal currently has $100 in a savings account and is saving $20 per week, while his brother Bill has $400 in
his account but is spending $10 a week. After how many weeks will they have the same amount of money in
their accounts? How much money will they each have?

1 point to define your variable

3 points for work shown

Let
x =
y =

4 points for writing equations
Sal's Equation:
Bill's Equation:

2 points for correct answer
#of weeks:
Amount of money