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3X = 3 - 5Y
X =
2) 6X-10Y= - 2 (REEMPLAZAMOS)
6 ( ) - 10Y = - 2
6 - 10 Y - 10 Y = - 2
Y= 2/5
AHORA HALLAMOS "X"
3X+5Y=3
3X+5 (2/5) = 3
3X=1
X= 1/3
AHORA COMPROBAMOS
6X-10Y= - 2
6(1/3)- 10 (2/5) = - 2
2-4= -2
-2 = - 2