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0,04x-0,05y=0,15.......*0,03.....2
-0,0012x+0,0028y=0,0092
0,0012x-0,0015y=0,0045
--------------------------------------------
0 + 0,0013y=0,0137
y=0,0137/0,0013
y=137/13
reemplazar en 1
-0,03x+0,07y= 0,23
-0,03x+0,07*137/13= 0,23
-0,03x+959/1300=0,23
x= (0,23-959/1300)/-0,03
x=220/13
verificación
-0,03x+0,07y= 0,23
-0,03*(220/13)+0,07*(137/13)= 0,23
0,23=0,23