0
Here's how I did it:
I set up my two equations:
xy=540
x+y=12
Then, by subtraction
x=12-y
By substitution:
xy=540
(12-y)y=540
12y-y2=540
-y2+12y-540=0
Through the quadratic formula...
y=6 ± -6i√14
If you use addition for y, then you should subtract for x, so that x + y = 12
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28
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28
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