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This is how to solve it using the elimination method
www.schooltube.com/video/49debd1e7a884bbcbbb1/
This is how you solve it using the substitution method
http://www.schooltube.com/video/a6e39c0b51d34b5b842c/
This is how you solve it by graphing
http://www.schooltube.com/video/a127184eec6b446fa2/