x+y=240 and 5x+8y=1614

solve by elimination
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1 Answer

x+y=240, so y=240-x

5x+8y=1614

5x+8*(240-x)=1614

5x-8x+1920=1614

-3x=1614-1920

-3x=-306

3x=+306

x=306/3=102
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