If the equation \[hxy+gx+fy+c=0\] represents a pair of straight lines,

1.	If the equation \[hxy+gx+fy+c=0\] represents a pair of straight lines, then
A.	\[fh=cg\]
B.	\[fg=ch\]
C.	\[{{h}^{2}}=gf\]
D.	\[fgh=c\]
Answer» C. \[{{h}^{2}}=gf\]

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If the equation \[hxy+gx+fy+c=0\] represents a pair of straight lines, then

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