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  5. Linear Equations in Two Variables

9th Class Mathematics Linear Equations in Two Variables Question Bank Linear Equations in Two Variables

  • question_answer
    If \[\angle A\]and\[\angle B\]are complementary angles and \[m\angle A\]is \[x,\]which equation can be used to find m ZB which is denoted by y?

    A) \[~y=(90{}^\circ +x)\]            

    B) \[~y=(90{}^\circ -x)\]

    C) \[~y=(180{}^\circ -x)\]   

    D) \[~y=\left( x+180{}^\circ  \right)\]

    Correct Answer: B

    Solution :

    We have give, \[\angle A+\angle B={{90}^{o}}\] \[\Rightarrow \]\[x+y={{90}^{o}}\Rightarrow y=({{90}^{o}}-x)\]


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