To create a system of three linear equations based on the description of the fruit salads made by Zadie, Raquel, and Joseph, we can translate the information given into equations where \( s \) represents the cost of strawberries per pound, \( g \) represents the cost of grapes per pound, and \( m \) represents the cost of melon per pound.
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Zadie's salad:
- 6 pounds of strawberries, 10 pounds of grapes, and 2 pounds of melon for a total cost of $30: \[ 6s + 10g + 2m = 30 \]
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Raquel's salad:
- 6 pounds of strawberries, 4 pounds of grapes, and 4 pounds of melon for a total cost of $40: \[ 6s + 4g + 4m = 40 \]
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Joseph's salad:
- 8 pounds of strawberries, 6 pounds of grapes, and 5 pounds of melon for a total cost of $55: \[ 8s + 6g + 5m = 55 \]
Now, we put together the equations we've formed:
- \( 6s + 10g + 2m = 30 \)
- \( 6s + 4g + 4m = 40 \)
- \( 8s + 6g + 5m = 55 \)
Among the given options, the following equation is part of the system:
6s + 4g + 4m = 40
So the correct response is: 6s + 4g + 4m = 40