7.The value of k for which the lines 2x + ky + 7 = 0 and 27x - 18y + 25 = 0 are perpendicular to each other is
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Answer:
k is 3
Step-by-step explanation:
the condition for perpendicular is the slope of both lines shud be such that their product is -1
slope of line 27x-18y+25
slope = -b/a
= -(-18)/27
=18/27
=2/3
slope of 2nd line = 2/3 * x = -1
x = -3/2
in this line 2x+ky+7,
slope = -k/2 = -3/2
so k =3
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