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Mathematics - Algebra

I am having some issues with these questions. I am just not getting it. Please help. All questions that are circled.
(Please see attachment)

The graphs of the following systems are given in (a) through (d). Match each system with ...

Solve each system by the substitution mehtod. Determine whether ...

Solve each system by addition ...

Solve each system by addition method. Determine whether equations are ...

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Solution Summary

Complete, Neat and Step-by-step Solutions are provided in the attached file.

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