x,y=nr.
2x+3y=80
x:y=)C=2,R=5
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a)x,y=?
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a) 2x+3y=80=)2x=80-3y=)x=80-3y/2
D=IxC+R
Le-am egalat 80-3y/2=2y+5 am amplificat cu 2 dupa mi-a dat asa 80-3y=4y+10=)-7y=-70=)y=10
x=2x+3x10=80=)2x+30=80=)2x=50=) x=25
