Question

If 5x + 3y + 7 = 0, kx – 7y + 8 = 0 are perpendicular, then k =

Answer 1

Answer:

if these line are perpendicular then

product of slope of the lines is -1

then

slope of first line -5/3

slope of second line k/7

then

(-5×k) /(3×7) =-1

5k/21 =1

k=21/5

ok

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