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Question : 76 of 120
Marks:
+1,
-0
Solution:
Given equation of lines,
‌=‌=‌ ⇒‌‌‌=‌=‌.....(i)
and
‌‌‌=‌=‌ ⇒‌‌‌=‌=‌.....(ii)
Here,
a1=2,b1=a,c1=4 a2=1,b2=2,c2=2 since, lines (i) and (ii) are perpendicular,
∴‌‌a1a2+b1b2+cfc2=0 ⇒‌‌2×1+a×2+4×2=0 ⇒‌‌2+2a+8=0 ⇒‌‌2a+10=0 ⇒‌‌2a=−10 ⇒‌‌a=−5
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