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Rezolvati R xR prin metodei substututiei x+2y=3 2x+y=3

Răspuns :

x+2y=3 =>x=3-2y (inlocuim in a doua ecuatie
2x+y=3
=> 2(3-2y)+y=3
6-4y+y=3
6-3y=3
-3y=3-6
-3y=-3
y=-3/-3
y=1
=>x+2y=3 <=>x+2×1=3 <=>x+2=3 =>x=3-2=1