To form a system of equations based on the information provided, we have the following variables:
- Let \( x \) represent the number of small candles sold.
- Let \( y \) represent the number of large candles sold.
From the problem, we can create two equations based on the total sales and the total number of candles sold:
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The total number of candles sold: \[ x + y = 28 \quad \text{(Equation 1)} \]
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The total revenue from selling the candles: \[ 4x + 6y = 144 \quad \text{(Equation 2)} \]
So, the system of equations is:
\[ \begin{cases} x + y = 28 \ 4x + 6y = 144 \end{cases} \]