To calculate the total amount the instructor makes from both Sandra and Bela, we first need to find out how much the instructor charges each of them separately using the given equation \( y = 8x + 12 \).
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Calculate Sandra's total cost:
- Sandra has 32 hours of lessons.
- Using the equation: \[ y = 8(32) + 12 = 256 + 12 = 268 \] Sandra pays $268.
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Calculate Bela's total cost:
- Bela has 24 hours of lessons.
- Using the same equation: \[ y = 8(24) + 12 = 192 + 12 = 204 \] Bela pays $204.
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Calculate the total amount for both Sandra and Bela: \[ \text{Total} = 268 + 204 = 472 \]
Thus, the total amount the instructor makes in a month from Sandra and Bela is 472.