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y=34-8x
45+2x=34-8x
45-34=-8x-2x
11= -10x
11÷ -10= x
-1.1=x
y=45+2*-1.1
y=45+(-2.2)
y=42.8
y=34-8*-1.1
y=34-(-8.8)
y=42.8
solución:(-1.1; 42.8)
Creo que está todo, pero si falta algo me lo puedes decir :D