Thursday, July 4, 2013

Solve by substitution 7x-4y=9 -3x+5y=-17

from 7x-4y=9 we get
%0D%0Ax=%284y%2B9%29%2F7%0D%0A 
%0D%0A-3%284y%2B9%29%2F7%2B5y=-17%0D%0A 

m7: 
%0D%0A-3%284y%2B9%29%2B35y=-119%0D%0A 

y=(-119+27)/(35-12)=-4 

so that means 

%0D%0Ax=%284y%2B9%29%2F7=%284%28-4%29%2B9%29%2F7=-1%0D%0A 

:)
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