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

  • question_answer
    A part of monthly expenses of a family on milk is fixed which is Rs. 700 and remaining varies with quantity of milk taken extra at the rate of Rs. 25 per litre. Taking quantity of milk required extra as x litres and total expenditure on milk as Rs. y, write a linear equation from the above information.

    A)  \[-25x+y=700\]

    B) \[20x+y=500\]

    C)        \[20x+10y=300\]

    D)        \[x+25y=900\]

    Correct Answer: A

    Solution :

    Since, \[x\]liters is the extra quantity of milk and y be total expenditure on milk. \[\therefore \]Required linear equation is \[700+25x=y\Rightarrow y-25x=700\] or \[-25x+y=700\]


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