If you do not live in the U.S (which I guess for certain), try going back up to 3 grades. You might not have come across and mastered all necessary knowledge.

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The correct soultion is y=1.  3x+2y=17 AND 5x+4y=21<=> 6x+4y=34 AND 5x-4y=21Add both sides of the left equation to both sides of the right equation.We get 11x=55, therefore x=5Substitute x=5 to 3x+...

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