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. 2x-3y=-4
.
....................................................................................................................
b) 5x-y=-3
. -2x+y=0
5x-y=-3......despejamos y....y sustituimos en la segunda ecuacion
5x-y=-3....-y=-3-5x..........y=3+5x
-2x+y=0...-2x+(3+5x)=0...5x-2x=-3...3x=-3...x=-3/3....x=-1
si x=-1 y=-2