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A line through (x1, y1, z1) with direction ratios a, b, c has Cartesian form:
A(x+x1)/a = (y+y1)/b = (z+z1)/c
B(x-x1)/b = (y-y1)/c = (z-z1)/a
C(x-x1)/a = (y-y1)/b = (z-z1)/c
Da(x-x1) = b(y-y1) = c(z-z1)
Answer & Solution
Correct answer: C. (x-x1)/a = (y-y1)/b = (z-z1)/c
Eliminating the parameter from x = x1 + λa, y = y1 + λb, z = z1 + λc gives equal ratios.
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