To represent Maria's savings problem using an equation of the form \(px + q = r\), we can define the variables and constants as follows:
- Let \(x\) be the number of weeks.
- The initial amount in her savings account is $50 (this is \(q\)).
- Each week, she saves an additional $19 (this is \(p\)).
- We want to find out when her total savings will reach $259 (this is \(r\)).
We can set up the equation based on this information:
\[ 19x + 50 = 259 \]
In this equation:
- \(p = 19\) (the amount saved each week),
- \(q = 50\) (the initial amount),
- \(r = 259\) (the target amount).
Now, to solve for \(x\), we can rearrange the equation:
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Subtract 50 from both sides: \[ 19x = 259 - 50 \] \[ 19x = 209 \]
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Divide both sides by 19: \[ x = \frac{209}{19} \] \[ x = 11 \]
Therefore, it will take Maria 11 weeks to reach $259 in her savings account.