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10 cards from this deck
How steep a line is; vertical change ÷ horizontal change
m=y2−y1x2−x1m = \frac{y_2 - y_1}{x_2 - x_1}m=x2−x1y2−y1
Vertical change divided by horizontal change
Line rises from left to right (goes upward)
Line falls from left to right (goes downward)
Equal slopes
m1×m2=−1m_1 \times m_2 = -1m1×m2=−1
The slope
y2−y1y_2 - y_1y2−y1
x2−x1x_2 - x_1x2−x1
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