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-(y/5)=1-x
y/5=(1-x)/-1
y=5(x-1)
y=5x-5
la segunda ecuación
(x/5)+y=27/5
y=(27/5)-(x/5)
igualamos las ecuaciones
5x-5=5.4-0.2x
5x+0.2x=5.4+5
5.2x=10.4
x=2
entonces
y=(5)x-5
y=5