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Algebra

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Steve for the two answer you gave me could you show me more detail how you came up with answers please Thanks

  • Algebra - ,

    another way is called elimination. You have

    5x - 9y = 7
    7y - 3x = -5

    Rearrange terms a bit to get

    5x - 9y = 7
    -3x + 7y = -5

    To get rid of the x values, find the LCM of 5 and 3: 15. Now multiply things a bit to get

    15x - 27y = 21
    -15x + 35y = -25

    Now you can add the two equations and the x terms disappear:

    8y = -4
    y = -1/2

    Now substitute that into either equation, and solve for x.

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