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A+b=315 4a+7b=1875 va rog sunt disperat!

Răspuns :

a+b=315
4a+4b=315x4=1260
4a+7b=1875
(4a+7b)-(4a+4b)=1875-1260=615
3b=615
b=615:3
b=205
a=315-205
a=110

Malinaclim
a+b=315 => a=315-b
4a+7b=1875
4(315-b)+7b=1875
1260-4b+7b=1875
1260+3b=1875
3b=1875-1260
3b=615
b=205
a=315-205=110

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