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10-91.

Solve these systems of equations using any method. Check each solution, if possible.  

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  • One strategy to solve this system of equations is to multiply the bottom equation by so you can eliminate.



    After finding , plug in its value into one of the equations to find the value of .


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  • Because one of the equations above is already solved for , one strategy to solve this system is to substitute the first equation in for in the second equation.

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  • Use the Equal Values Method.

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  • Refer to part (a).