First slide

Straight lines in 3D

Question

Equation of a line through $(α, β, γ)$ and parallel to Y-axis are

Moderate

A

$\frac{x - α}{1} = \frac{y - β}{0} = \frac{z - γ}{0}$
B

$\frac{x - α}{0} = \frac{y - β}{1} = \frac{z - γ}{0}$
C

$\frac{x - α}{0} = \frac{y - β}{0} = \frac{z - γ}{1}$
D

$\frac{x - α}{1} = \frac{y - β}{1} = \frac{z - γ}{1}$

Solution

$\frac{x - α}{0} = \frac{y - β}{1} = \frac{z - γ}{0}$ drs of y-axis is (0,1,0)

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