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July 25, 2014

July 25, 2014

Posted by **Anonymous** on Wednesday, January 9, 2013 at 6:18am.

- Govt school math -
**Anonymous**, Wednesday, January 9, 2013 at 6:21amSolve the question by substitution method? Equation 1st x+y=18 equation 2nd 2x+y=27

- Govt school math -
**Reiny**, Wednesday, January 9, 2013 at 9:05amsubtract 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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