Question

Ans. x + y
.
5 Find the equations of the straight lines
passing through the origin and making
equal angles with the coordinate axes.​

Answer 1

Answer:

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Step-by-step explanation:

Let the line makes α,β,r angles with the coordinates axes, (in this case, α=β=r)

∵cos2α+cos2β+cos2r=1

∴3cos2α=1 (∵α=β=r)

⇒cosα=±31

∴ Direction cosine is (±31,±31,±31)

∴ equation of required line is

±31x−0=±31y−0=±31z−0