JEE Math Practice Question
The two lines $$x=ay+b, z=cy+d;$$ and $$x=a'y+b' ,$$ $$z=c'y+d'$$ are perpendicular to each other if :
- A.$$aa'+cc'=-1$$
- B.$$aa'+cc'=1$$
- C.$${a \over {a'}} + {c \over {c'}} = - 1$$
- D.$${a \over {a'}} + {c \over {c'}} = 1$$
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