find the value of k if the angle between the stright line kx+y+9=0and3x_y+4=0is π/4
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Answer:
theta is 45
then
tan theta is +-(m1-m2/1+m1m2)
1=+-(-k-3/1-3k)
1=-(K+3/1-3k)
3k-1=k+3
k=2
or
k=-2
ok
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