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12 cards from this deck
How steep a line is and which direction it's going
m=y2−y1x2−x1m = \frac{y_2 - y_1}{x_2 - x_1}m=x2−x1y2−y1
Vertical change divided by horizontal change
Lines that never meet, no matter how far extended
m1=m2m_1 = m_2m1=m2
Lines that meet at exactly 90 degrees (right angle)
m1×m2=−1m_1 \times m_2 = -1m1×m2=−1
m2=−1m1m_2 = -\frac{1}{m_1}m2=−m11 (negative reciprocal)
Same scale on both axes
−12-\frac{1}{2}−21
−32-\frac{3}{2}−23
Check gradients mathematically, not visually
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