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calculati x si y daca x+3y=-1. 2x-y=5​

Răspuns :

x=-1-3y

2x-y=5
2(-1-3y)-y=5
-2-6y-y=5
-7y=5+2
-7y=7

y=-1

2x+1=5
2x=5-1
2x=4
x=2