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3x-5y-4=0 and 9x=2y+7

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3x-5y-4=0 and 9x=2y+7

    • Posted by Preet Kaur 5 years, 5 months ago

    CBSE > Class 10 > Mathematics
    • 3 answers

    Vishvajit Yadav 5 years, 5 months ago

    3x-5y=4---------(1) 9x-2y=7---------(2) from Equation (2) we get, 9x-2y=7 9x=7+2y x=7+2y/9 putting the value of x in equation (1) 3x-5y=4 3×(7+2y/9)-5y=4 7+2y/3-5y=4 7+2y-15y =4 ________ 3 7-13y=. 4/1 ______ 3 cross multiplication 7-13y=12 -13y=12-7 -13y=5 13y =-5 y=-5/13 putting the value of y in eqution (3) x =7+2y/9 x=[7+2×(-5/13)]×1/9 x=[7-10/13]×1/9 x=[91-10/13] ×1/9 x=81/13×1/9 x=9/13 hence x=9/13and y-5/13

    0Thank You

    Yogita Ingle 5 years, 5 months ago

    3X - 5Y = 4----------(1)

    9X - 2Y = 7-------------(2)

    From EQUATION (1) we get,

    3X - 5Y = 4

    3X = 4+5Y

    X = 4+5Y/3 -------------(3)

    Putting the value of X in equation (2)

    9X - 2Y = 7

    9 × (4+5Y/3) - 2Y = 7

    3(4+5Y) - 2Y = 7

    12 + 15Y - 2Y = 7

    13Y = 7 -12

    13Y = -5

    Y = -5/13

    Putting the value of X in equation (3)

    X = 4+5Y/3 => 3 + 5 × -5/13 = 3 - 25/13 /3

    X = 39 - 25/13/3 = 14/13/3 => 14/13 × 1/3 => 14/9

     

    0Thank You

    Samish Kumar 5 years, 5 months ago

    y=5/17 and x=43/51

    0Thank You

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