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2x-y=3 ec2
de la ecuación 1 sustituye y en ec2
2x-y=3
2 (5x-10)-(5x-10)=3
10x-20-5x+10=3
10x-5x=3+20-10
5x=13
x=13/5 sustituye x en la ec1
5(x-2)=y
5 (13/5-2)=y
5 (3/5)=y
3=y
R// x=13/5. y=3