Two lines are represented by equations x+y=1 and x+ky=0are mutually orthogonal if k is
1
-1
0
None of these
Find the value of K:
Let the slope of the line x+y=1 be m1=-1
Let the slope of the line x+ky=0be m2=-1k
Now, for perpendicular lines =m1×m2=-1
⇒-1×-1k=-1⇒k=-1
Hence, the correct option is (B).