Q. 235.0( 2 Votes )

The value of <spa A. 1

B. –1

C. 2

D.

Answer :

When the straight lines 3x + 6y + 7 = 0 and 2x + ky = 5 are perpendicular the product of their slopes should be equal to –1 .


Slope of 3x + 6y + 7 = 0 is:


; ()


Slope of 2x + ky = 5 is:



Now we have .


when we substitute the values of m1 and m2 we get:




1 = (–1)×k


1 = –k or k = –1

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