Posted by dj on Sunday, October 5, 2008 at 2:17pm.
5x=7+4y, so
5x-4y=7. Multiply both sides by 4, and you get:
20x-16y=28. But that's the other equation you were given - so you've actually only got one equation there, not two. And you can feed any value of x into that equation and get a corresponding value of y out.
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