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To model the cost of renting tables from Parties 'R Us and Rob's Rentals, we can create two linear equations based on the given information.
1. **Parties 'R Us**:
- Delivery fee: $60
- Cost per table: $4
- Total cost, \( C \), for \( t \) tables can be expressed as:
\[
C = 60 + 4t
\]
2. **Rob's Rentals**:
- Delivery fee: $40
- Cost per table: $6
- Total cost, \( C \), for \( t \) tables can be expressed as:
\[
C = 40 + 6t
\]
The pair of linear equations that model this situation is:
\[
\begin{align*}
C &= 60 + 4t & \text{(Parties 'R Us)} \\
C &= 40 + 6t & \text{(Rob's Rentals)}
\end{align*}
\]