The slope of the line through points $(x_1, y_1)$ and $(x_2, y_2)$, where $x_1 \ne x_2$, is:
A$\dfrac{y_2 + y_1}{x_2 + x_1}$
B$\dfrac{x_2 - x_1}{y_2 - y_1}$
C$(y_2 - y_1)(x_2 - x_1)$
D$\dfrac{y_2 - y_1}{x_2 - x_1}$
Answer & Solution
Correct answer: D. $\dfrac{y_2 - y_1}{x_2 - x_1}$
Slope = rise / run = $\dfrac{y_2 - y_1}{x_2 - x_1}$.
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