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(5)-3x+4y=0
esto te da=
15x-18y=-12
-15+20y=0
ahora lo sumas te da
2y=-12
despejas=
y=-12/2
y=-6
y remplazas
5x-6(-6)=-4
resulves y te dara
x=-8
y la otra
(2)3x+4y=-10
(-3)2x+5y=5
6x+8y=-20
-6x-15y=-15
sumas
-7y=-35
y=-35/-7
Y=5
remplazas=
2x+5(5)=5
despejas
eso te da=
x=-10