- The slope of a line through two points \((x_1, y_1)\) and \((x_2, y_2)\) is given by the formula \(\frac{y_2 - y_1}{x_2 - x_1}\).
- Applying this formula to the points \( P(3, f(3)) \) and \( Q(x, f(x)) \), we get:
\[
\text{Slope of secant line} = \frac{f(x)
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