The slope-intercept form of a linear equation is given by \( y = mx + b \), where \( m \) is the slope and \( b \) is the y-intercept.
In this scenario:
- The amount of money \( y \) Jonas has after \( x \) weeks can be represented.
- Jonas starts with $50, so \( b = 50 \).
- Each week, he adds $3, so \( m = 3 \).
Putting it all together, the equation that represents the relationship between the amount of money \( y \) and the number of weeks \( x \) is:
\[ y = 3x + 50 \]