pair-st-lines

Question: The condition of representing the coincident lines by the general quadratic equation $f(x,\,y)=0$, is

1) $\Delta =0$ and ${{h}^{2}}=ab$

2) $\Delta =0$ and $a+b=0$

3) $\Delta =0$ and ${{h}^{2}}=ab$, ${{g}^{2}}=ac$, ${{f}^{2}}=bc$

4) ${{h}^{2}}=ab$, ${{g}^{2}}=ac$ and ${{f}^{2}}=bc$

Solution:

Explanation: No Explanation

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