Question 310775
x+6y=16
-x+6y=8 
I did come up with 12y=8 and then I get stuck.
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Good so far:
12y = 8
y = 2/3
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Substitute into x+6y = 16
x + 6(2/3) = 16
x + 4 = 16
x = 12
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Cheers,
Stan H.