- Calculate the slope (m) of the supply line using two points, e.g., (15, 500) and (30, 605).
\[
m = \frac{605 - 500}{30 - 15} = \frac{105}{15} = 7
\]
- Use the point-slope form to find the equation: \( Q_s = mP + b \).
- Substitute one point, e.g., (15, 500),
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