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    substitution or addition/elimination technique to solve system of equations

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    Use substitution or addition/elimination technique to solve system of equations.
    Show steps of solution. please apply apply both techniques.

    here it is...

    2x + y = 6
    x - y = -3

    © BrainMass Inc. brainmass.com October 10, 2019, 2:17 am ad1c9bdddf
    https://brainmass.com/math/linear-algebra/substitution-addition-elimination-technique-370571

    Solution Preview

    Substitution:
    1) Solve one of the equations for one of the variables. Say, solve the first equation for y:
    y=6-2x
    2) Substitute this expression for y into the other equation:
    x - (6-2x) = -3
    The equation becomes an equation in one variable only. Solve it for that vaiable:
    x - 6 + 2x = -3
    3x - 6 = -3
    3x = -3+6
    3x = 3
    x = 1
    3) Substitute the value that you found into ...

    Solution Summary

    This posting offers help with using substitution or addition/elimination technique to solve a system of equations.

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