Tobias has $170 in his savings account and spends $7 of it every week. Roberta has $126 in her savings account and saves another $4 every week. On your Work Page, neatly and clearly write a system of equations for the situation. Let x represent the number of weeks and let y represent the total amount of savings. Solve the system algebraically, showing all of your work. Then answer the question.

How long will it take for Tobias and Roberta to have the same amount of money? (Include the unit of measurement.)