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AlynM
a fost răspuns

7a+3b=29. a+b=7. Det a,b. Pls urgent dau coroana

Răspuns :

Ana23mariap
7a+3b=29 =>a=(29-3b)/7
a+b=7=>a=7-b

(29-3b)/7=7-b
29-3b=49-7b
-3b+7b=49-29
4b=20/4
b=5

a+b=7
a=7-b=7-5=2
a=2