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Rezolvati prin metoda substitutiei sistemul
4x-3y=18
5x-2y=19


Răspuns :

4x-3y=18
5x-2y=19
x=(18+3y)/4
5
(18+3y)/4-2y=19
90+15y-8y=76
7y=-14
y=-2
x=[18+3(-2)]/4=(18-6)/4=12/4=3

solutia x=3
           y=-2