(2x+3y=11) (x+3y=18)

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1 Answer

Subtract second equation from first: x=-7, because 3y cancels out. Now put x=-7 in either equation, for example, the second: -7+3y=18. Add 7 to each side: 3y=25, so y=25/3=8.33...33 or 8 and one third.

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