Given lines are 2x−y+3=0, 6x+3y+1=0 and αx+2y−2=0.
These lines will not form a triangle if αx+2y−2=0 is concurrent with 2x−y+3=0 and 6x+3y+1=0 or parallel to either of them.
Case-1: Concurrent lines
⇒∣26α−13231−2∣=0
⇒2(−6−2)+1(−12−α)+3(12−3α)=0
⇒−16−12−α+36−9α=0
⇒−10α+8=0
⇒α=54
Case-2: Parallel lines
6−α=3−2, −2α=−1−2
⇒α=4, α=−4
⇒P=16+16+2516
[P]=[32+2516]=32