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10 cards from this deck
r = r0 + λv, with r0 as a point and v as a direction vector.
It shows the line's orientation in space.
x = x0 + aλ, y = y0 + bλ, z = z0 + cλ.
Direction vectors are scalar multiples of each other.
Their direction vectors' dot product equals zero.
Set parametric equations equal and solve for parameters.
Substitute parameters into equations to check consistency.
They describe lines precisely with vectors.
r = r0 + λv; r0 is point, v is direction
Their direction vectors are scalar multiples.
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