Răspuns :
stiind ca , determinati 19+2x+2y.
[tex]x+y+13=24 \\ \\ => x + y = 24 - 13 \\ \\ 19 + 2x + 2y = 19 + 2(x+y)=19 + 2(24 - 13)=19 + 48 - 26 = 41[/tex]
[tex]x+y+13=24 \\ \\ => x + y = 24 - 13 \\ \\ 19 + 2x + 2y = 19 + 2(x+y)=19 + 2(24 - 13)=19 + 48 - 26 = 41[/tex]