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19x+8y=236
Multiplicacmos ecu.1 x 8
120-8y=320
19x+8y=236 se cancelas las y
____________- restamos
139x=556
x= 556/139
x=4
Encontremos el valor de y=
Reemplazamos x=4 en ecu.2
19x+8y=236
19(4)+8y=236
76+8y=236
8y= 160
y= 160/8= 20
Comprobando
Ecuacion 1
15x-y=40
15(4)-20=40
19x+8y=236
19(4)+8(20)=236