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Q.

If the points (1,2)  and (3,4)  were to be on the same side of the line 3x−5y+a=0  then

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a

7

b

a=7

c

a=11

d

a<7  or a>11

answer is D.

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Detailed Solution

L11=31-52+a =a-7 and L22=33-54+a =a-11 ⇒the given two points are on the same side of the line L≡3x-5y+a ⇒L11L22>0⇒a-7a-11>0 ⇒a<7 or a>11
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If the points (1,2)  and (3,4)  were to be on the same side of the line 3x−5y+a=0  then