Răspuns :
5a + 4b = 22
5a + b = 19
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scazute 5a + 4b - 5a - b = 22 - 19
3b = 3
b = 3 :3 = 1
5a + b = 19
---------------------------------
scazute 5a + 4b - 5a - b = 22 - 19
3b = 3
b = 3 :3 = 1
[tex]5a+4b-5a-b=22-`19 \\ 3b=3=\ \textgreater \ b=3:3=\ \textgreater \ b=1[/tex]