Posted by Katrina on Monday, August 2, 2010 at 12:16am.
Putting the y in (substitution)..
x + 8(-2/7x-18/7)=18
x-16/7x-144/7=18
These fractions get ridiculous so I'm sure you can work it out from there. Get rid of the -144/7 by adding 144/7 to the right side. Then do x-16/7x. Then solve.
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