AP EAMCET · Maths · Straight Lines
If the pair of straight lines represents two parallel lines then
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
Given, 9x2+axy+4y2+6x+by-3=0 represents two parallel lines, So, △=0⇒2fgh+abc-af2-bg2-ch2=0 on comparing with ax2+2hxy+by2+2gx+2fy+c=0 We get, △=a×3×b2+9×4×-3-9b22-4×9+3a22=0 ⇒ab2-3b24+a24=48 ...........1 Also for parallel…
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