Question

Direction ratios of the line represented by the equation $x = a y + b$ $z = c y + d$ are

• A. (a, 1, c)
• B. (a, b – d, c)
• C. (c, 1, a)
• D. (b, ac, d)

Answer 1

Answer: (A)

(a, 1, c)

Answer 2

$x - a y - b = 0$ and $c y - z + d = 0$

If l, m, n are direction cosines, then $\frac { l } { a } = \frac { m } { 1 } = \frac { n } { c }$.

Hence direction ratios are (a, 1, c).