TS EAMCET · Maths · Pair of Lines
If \((-1,-1)\) is the point of intersection of the pair of lines \(2 x^2+5 x y-3 y^2+2 \mathrm{~g} x+2 \mathrm{f} y+\mathrm{c}=0\) then \(\mathrm{g}+\mathrm{f}=\)
- A 4 c
- B 3c
- C 2c
- D c
Answer & Solution
Correct Answer
(D) c
Step-by-step Solution
Detailed explanation
\( \frac{\partial}{\partial x}(2 x^2+5 x y-3 y^2+2 \\mathrm{~g} x+2 \\mathrm{f} y+\\mathrm{c}) = 4x+5y+2g \) \( 4(-1)+5(-1)+2g=0 \Rightarrow -9+2g=0 \Rightarrow g = 9/2 \)…
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