To model the revenue equation for Minglei's sales, we can express the total revenue based on the number of each item sold.
- Popcorn: $3 per bag, so the revenue from popcorn is \( 3x \).
- Pita chips: $5 per bag, so the revenue from pita chips is \( 5y \).
- Hummus: $6 per container, so the revenue from hummus is \( 6z \).
The total revenue from all three items sold can be expressed as:
\[ 3x + 5y + 6z = 270 \]
where:
- \( x \) is the number of bags of popcorn sold,
- \( y \) is the number of bags of pita chips sold,
- \( z \) is the number of containers of hummus sold.
Thus, the revenue equation that best models Minglei’s sales is:
\[ 3x + 5y + 6z = 270 \]