Maths-
General
Easy
Question
Lines q and r in the xy-plane are perpendicular and intersect at the origin. If line r passes through (1, k), what is the equation of line q ?
The correct answer is:
let the equations of lines passing through origin will be y = M1 x and y = M2 x
be the lies q and r respectively.
Step 1 :- Find M2 in terms of k using (1, k)
y = M2 x ⇒ k = M2 (1) ⇒ M2 = k
Step 2 :- find the slope M1 in terms of k using perpendicular condition
Then M1 × M2 = - 1 ⇒ k × M2 = - 1M2 = -
Step 3 :- find the equation of line q.
y = M2 x and substitute M2 = -
∴ y = -
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