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-2y+ky=1
-ky-2y=2
Aislo las k:
k=(1+2y)/y
k=-(2+2y)/y
Por igualación:
(1+2y)/y=-(2+2y)/y
1+2y=-2-2y
4y=-3 » y= -3/4
Sustituimos en una expresión con k:
k=(1+2y)/y
k=(1-3/2)/(-3/4) » (-1/2)/(-3/4) » k=4/6=2/3