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Q.

If the point P3a2,1 lies between the two different lines x+y=a and x+y=2a , then the least positive integral  value of a is

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answer is 3.

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Detailed Solution

Point 32a,1 lies between two different lines x+y=a and x+y=2a .   If a point P(x1,y1) lies in between two parallel lines L1=0 and L2=0 if and only if L11×L22<0∴ 32a+1−a32a+1−2a<0a2+11-a2<0a+2a-2>0a∈(−∞,−2)∪(2,∞)Therefore, the least positive integral value of a is 3
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