Question

If $\frac { x - 1 } { l } = \frac { y - 2 } { m } = \frac { z + 1 } { n }$is the equation of the line through

(1, 2, –1) and (–1, 0, 1), then (l, m, n) is

• A. (–1, 0, 1)
• B. (1, 1, –1)
• C. (1, 2, –1)
• D. (0, 1, 0)

Answer 1

Answer: (B)

(1, 1, –1)

Answer 2

$\frac { - 2 } { l } = \frac { - 2 } { m } = \frac { 2 } { n }$; $\therefore ( l , m , n )$ are $( 1,1 , - 1 )$.