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7 November, 22:04

To solve a system of equations by substitution what is the best first step

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  1. 7 November, 22:11
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    Isolate one variable to one side.

    Step-by-step explanation:

    Example:

    x+y = 8

    2x+y=2

    Then, take the second (or first, your choice) then isolate a variable:

    2x+y=64 = y=2-2x

    then plug the equation in:

    x+2-2x=8

    -3x=6

    x=-2
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