The lines \[{{a}_{1}}x+{{b}_{1}}y+{{c}_{1}}=0\]and \[{{a}_{2}}x+{{b}_{2}}y+{{c}_{2}}=0\] are perpendicular to each other, if [MP PET 1996]

\[a_{1}^{2}{{b}_{2}}+b_{1}^{2}{{a}_{2}}=0\]

\[{{a}_{1}}{{b}_{2}}-{{b}_{1}}{{a}_{2}}=0\]

\[{{a}_{1}}{{a}_{2}}+{{b}_{1}}{{b}_{2}}=0\]

\[{{a}_{1}}{{b}_{1}}+{{a}_{2}}{{b}_{2}}=0\]

The lines \[{{a}_{1}}x+{{b}_{1}}y+{{c}_{1}}=0\]and \[{{a}_{2}}x+{{b}_{

1.	The lines \[{{a}_{1}}x+{{b}_{1}}y+{{c}_{1}}=0\]and \[{{a}_{2}}x+{{b}_{2}}y+{{c}_{2}}=0\] are perpendicular to each other, if [MP PET 1996]
A.	\[{{a}_{1}}{{b}_{2}}-{{b}_{1}}{{a}_{2}}=0\]
B.	\[{{a}_{1}}{{a}_{2}}+{{b}_{1}}{{b}_{2}}=0\]
C.	\[a_{1}^{2}{{b}_{2}}+b_{1}^{2}{{a}_{2}}=0\]
D.	\[{{a}_{1}}{{b}_{1}}+{{a}_{2}}{{b}_{2}}=0\]
Answer» C. \[a_{1}^{2}{{b}_{2}}+b_{1}^{2}{{a}_{2}}=0\]

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The lines \[{{a}_{1}}x+{{b}_{1}}y+{{c}_{1}}=0\]and \[{{a}_{2}}x+{{b}_{2}}y+{{c}_{2}}=0\] are perpendicular to each other, if [MP PET 1996]

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