To represent the problem with an equation in the form \( px + q = r \), we need to define the variables and set up the equation based on the information given.
Maria starts with $50 and saves $19 each week. We can let \( x \) be the number of weeks. After \( x \) weeks, her total savings would be:
\[ 50 + 19x \]
We want this total to equal $259:
\[ 50 + 19x = 259 \]
Now, this matches the form \( px + q = r \), where:
- \( p = 19 \)
- \( q = 50 \)
- \( r = 259 \)
The correct representation of the problem in the specified equation form is:
19x + 50 = 259.