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10th Class Mathematics Pair of Linear Equations in Two Variables Question Bank MCQs - Pair of Linear Equations in Two Variables

  • question_answer
    The equations \[ax+by+c=0\]and \[dx+ey+c=0\]represent the same straight line if:

    A) \[ad=be\]

    B) \[ac=bd\]

    C) \[bc=ad\]

    D) \[ab=de\]

    Correct Answer: D

    Solution :

    [d] \[\frac{a}{d}=\frac{b}{e}=\frac{c}{c}\]
    \[\Rightarrow \,\,\,\,\,\,\,\frac{a}{d}=1,\,\frac{b}{e}=1\Rightarrow a=d,\,\,b=e\Rightarrow ab=de\]


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