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6-81.

Solve the following systems of equations using any method. Check each solution, if possible. Homework Help ✎


  1. Use the Elimination Method.



    Find then input the answer into one of the equations above to find .


  1. Use the Substitution Method. The equivalent of is already given.

    and


  1. Refer to parts (a) and (b) for help. Be aware of the in the first equation.


  1. Use the elimination method like in part (a).

    Multiply the first equation by .