3m stofa.........................6m panza...........................408lei 7m stofa........................12m panza..........................918lei ____________________________________________________ Aducem la acelasi termen de comparatie inmultind prima relatie cu 2 .
3m stofa costa 102x3=306 lei 6m panza costa 408-306=102 lei 1m panza costa 102:6=17 lei 2m sofa costa 102x2=204 lei 204+17=221 ( atat plateste pentru 1m de panza si 2 m de stofa )
x- m de stofa y- m de panza 3x+6y=408 7x+12y=918 o inmultim pe prima cu -2 si obtinem -6x-12y=-816 prin adunarea celor 2 ecuatii obtinem x/=102 3*102+6y=408 306+6y=408 6y=102 y=17
