A) 50
B) 52
C) 54
D) 56
Correct Answer: A
Solution :
\[{{s}_{1}}-{{s}_{2}}=0\] \[\Rightarrow \,6x+14y\,+c+d=0\] As (1,-4)lies on it, \[\Rightarrow \,6-56\,+c+d=0\] \[\Rightarrow \,c+d=50\]
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