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in Two Dimensional Analytical Geometry by (46.9k points)
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If the two straight lines x + (2k – 7)y + 3 = 0 and 3kx + 9y – 5 = 0 are perpendicular then the value of k is …

(a) k = 3

(b) k = 1/3

(c) k = 2/3

(d) k = 3/2

1 Answer

+1 vote
by (49.1k points)
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Best answer

(a) k = 3

Since the lines are perpendicular m1 m2 = – 1

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