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Q. Slope of non-vertical line passing through the points $(x_1, y_1)$ and $(x_2, y_2)$ is given by :

Straight Lines

Solution:

$m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{y_1 - y_2}{x_1 - x_2} , x_1 \neq x_2$