Posted by Anonymous on Wednesday, January 9, 2013 at 6:18am.
Solve the question by substitution method? Equation 1st x+y=18 equation 2nd 2x+y=27
subtract the first from the second ...
2x+y = 27
x + y = 18
-----------
x = 9
sub into the 1st:
9+y = 18
y = 9
so x=9 and y=9
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