X+Y =36 DESPEJO X = 36-Y
5000X+2000Y= 129000
REEMPLAZO X EN LA 2DA ECUACION
5000(36-Y)+2000Y =129000
180000-Y+2000Y=129000
-Y+2000Y=129000-180000
1999y=-51000
Y= 5100:1999
Y =25
VERIFICO REEMPLAZANDO
X+Y =36
X+25=36
X=36-25
X=11
HAY 11 BILLETES DE 5000 Y 25 DE 2000
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X+Y =36 DESPEJO X = 36-Y
5000X+2000Y= 129000
REEMPLAZO X EN LA 2DA ECUACION
5000X+2000Y= 129000
5000(36-Y)+2000Y =129000
180000-Y+2000Y=129000
-Y+2000Y=129000-180000
1999y=-51000
Y= 5100:1999
Y =25
VERIFICO REEMPLAZANDO
X+Y =36
X+25=36
X=36-25
X=11
HAY 11 BILLETES DE 5000 Y 25 DE 2000