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

  • question_answer
    If\[x+y=(a-b),y+z=(b-c),z+x=(c-a),\]then the average of\[\left( x+y+z \right)\]is..........

    A)  \[b-a+c\]                     

    B)  \[0\]          

    C)  \[a-b-c\]           

    D)  \[a+b+c\]

    Correct Answer: B

    Solution :

    (b): Simply by adding three eqns. \[2(x+y+z)=0\Rightarrow \frac{x+y+z}{3}\] = Average = 0


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