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  5. Pair of Linear Equations in Two Variables

10th Class Mathematics Pair of Linear Equations in Two Variables Question Bank Linear Equation in two Variables

  • question_answer
    In \[\Delta ABC,\] if \[\angle A=x{}^\circ ,\angle B=3x{}^\circ ,\angle C=y{}^\circ \] and \[3y{}^\circ -5x{}^\circ =30\]. Then \[\Delta ABC\] is

    A)  A right angled triangle       

    B)  An isosceles triangle

    C)  An equilateral triangle              

    D)  A right angled isosceles triangle

    Correct Answer: A

    Solution :

    (a): \[x+3x+y=180{}^\circ \] \[3y-5x=30{}^\circ \Rightarrow x=30{}^\circ ,y=60{}^\circ \] \[\therefore 3x=90{}^\circ \]      


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