If the lines x+y=0,x−y=0 and 2x+3y–6=0 are the sides of a triangle and (– 2,a) is an interior point of the triangle then a lies
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a
2
b
−2
c
−1
d
−3
answer is A.
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Detailed Solution
The given sides of the triangle are x+y=0,x-y=0, and 2x+3y-6=0 Vertices are (0,0), 65,65,-6,6If (-2,a) is an interior point to the triangle, origin and (-2,a) lies on the same side of the line 2x+3y-6=0 Hence, -6-4+3a-6>0 3a-10<0 a<103 If (-2,a) is an interior point to the triangle, then 65,65 and (-2,a) lies on the same side of the line x+y=0 125-2+a>0 a-2>0 a>2If (-2,a) is an interior point to the triangle, then -6,6 and (-2,a) lies on the same side of the line x-y=0 -12-2-a>0 a+2>0 a>-2From all the above three cases 2