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March 26, 2017

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solve by elimination
2r-5s =-22
5r+2s = 32

  • algebra - ,

    2r - 5s = -22
    5r + 2s = 32

    Multiply 1st Eq by 5 and 2nd Eq by -2.

    10r - 25s = -160
    -10r -4s = -64
    Add the 2 Eq

    -29s = -174
    5 = 6
    Substitute 6 for s in original Eq
    and solve rfor r.

    2r - 5*6 = -22
    2r = -22 + 30 = 8
    r = 4.

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