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March 29, 2017

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pleae help solve: 3x-5y=7 and 5x-2y=-1

  • algebra - ,

    3x-5y=7 times 5 15x-25y=35
    5x-2y=-1times 3 15x -6y=-3
    subtract second from first
    0x -19y = 38
    y = -2
    3x-5(-2) = 7
    3x +10 =7
    3x = -3
    x = -1

    check
    3(-1) -5(-2) = 7 yes
    5(-1)-2(-2)=-1 yes

  • algebra 2 - ,

    25y to the second power times x to the second power plus 20xy to the second power plus 4x to the second power

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