Răspuns :
notam
x ap cu 2 camere
y ap cu 4 camera,
atunci avem
2*x+4*y=190 camere
dar mai stim x+y=60
x=60-y
inlocium in prima relatie si avem
2*(60-y)+4y=190
120-2y+4y=190
120+2y=190
2y=190-120=70
y=70:2=35 ap cu 4 camere
x=60-35=25 ap cu 2 camere
proba
2*25=50 camere
4*35=140 camere
50+140=190 camera ( atat cat a spusproblema )
Succes !
x ap cu 2 camere
y ap cu 4 camera,
atunci avem
2*x+4*y=190 camere
dar mai stim x+y=60
x=60-y
inlocium in prima relatie si avem
2*(60-y)+4y=190
120-2y+4y=190
120+2y=190
2y=190-120=70
y=70:2=35 ap cu 4 camere
x=60-35=25 ap cu 2 camere
proba
2*25=50 camere
4*35=140 camere
50+140=190 camera ( atat cat a spusproblema )
Succes !
[tex]x-nr. \ de \ apartamente \ cu \ 2 \ camere \\ y-nr. \ de \ apartamente \ cu \ 4 \ camere \\\\ \left \{ {{x+y=60} \ |(-2) \atop {2x+4y=190}} \right. \\\\ \left \{ {{-2x-2y=-120} \atop {2x+4y=190}} \right. \\ ========= \\\\ 2y=70 \ |:2 \\\\ \boxed{y=35} \\\\ x+y=60 \\\\ x=60-y \\\\ x=60-35 \\\\ \boxed{x=25} [/tex]