2x+y=21 evem 3x+5y=49 ka paristhapan vidhi se hal gyat kre

Question

2x+y=21 evem 3x+5y=49 ka paristhapan vidhi se hal gyat kre

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Evelyn 4 weeks 2021-12-26T10:43:20+00:00 2 Answers 0 views 0

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    0
    2021-12-26T10:44:31+00:00

    Answer:

    2x+y=21——-(1)

    3x+5y=49——(2)

    multiplying equation (1) by 5.

    5(2x)+5×y=21×5

    10x+5y=105——–(3)

    subtracting equation (2) from (3)

    {10x+5y=105}-{3x+5y=49}

    7x=56

    x=56÷7

    x=8

    substitute x=8 in equation (1)

    2x+y=21

    2×8+y=21

    16+y=21

    y=21-16

    y=5

    solution : (x,y)=(8,5)

    0
    2021-12-26T10:44:42+00:00

    Answer:

    2x+y =21—–(1)

    3x+5y=49—–(2)

    multiplying equation (1) by 5

    10x+5y =105——(3)

    subtracting equation (2) from (3)

    {10x+5y =105}-{3x+5y=49}

    7x=56

    x=56÷7

    x=8

    put x=8 in equation (1)

    2x+y =21

    2×8+y=21

    16+y =21

    y =21-16

    y=5

    solution=(x,y)=(8,5)

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