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10 cards from this deck
Identical gradients
−1-1−1
- rac{1}{m}
y−y1=m(x−x1)y - y_1 = m(x - x_1)y−y1=m(x−x1)
Intersect
tanθ\tan \thetatanθ
Right angle (90°)
Parallel
Product of both gradients
−12-\frac{1}{2}−21
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