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March 24, 2017

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Process of eliminiation method ? Is there a solution, infinity or no solution. I don't get it. Can anyone help me?
3r - 5s = -27
5r + 3s = 23

  • algebra - ,

    multiply the top by 3 and the bottom by 5 to eliminate the s's
    9r-15s=-81
    25r+15s=115
    add the rows together
    34r=34
    divide both sides by 34
    r=1
    plugging in r=1 to either equation
    5+3s=23
    subtract 5 from both rows
    3s=18
    s=6
    solution: r=1, s=6

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