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10 cards from this deck
Steepness/slope of a line
m=y2−y1x2−x1m = \frac{y_2 - y_1}{x_2 - x_1}m=x2−x1y2−y1
Equal gradients: m1=m2m_1 = m_2m1=m2
Product = -1: m1×m2=−1m_1 \times m_2 = -1m1×m2=−1
0 (zero)
Undefined
y=mx+cy = mx + cy=mx+c (m=gradient, c=y-intercept)
Points lying on the same straight line
Vertical change divided by horizontal change
Negative inverses of each other
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