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-9x +y =17 9x + 9y=19 solve for y equation 1
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-9x +y =17 9x + 9y=19
solve for y equation 1

User Sandbox
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-9x + y = 17
9x + 9y = 19
------------------add
10y = 36
y = 36/10 = 18/5 <==
User Fis
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