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how would i use substitution for the equations x+y=56 and x+(3y)=56

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    Isolate x or y in either equation and then subsitute it in to the other equation.
    x+y=56
    x=56-y
    Subsitute into the other equation:
    Since x=56-y, the other equation becomes (56-y)+3y=56
    56+2y=56 subtract 56 from both sides
    2y=0
    y=0/2
    y=0
    then x must be 56

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