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a) 8x-4y=7
(4) -2x+y=-4
8x-4y=7
-8x+y= -4
elminar terminos semejantes
-3y=3
3/-3
y=-1
b)(4)3x+6y=9
(-3)4x+8=12
12x+24y=36
-12x-24y=-48
0=-12, este tiene infinitas soluciones porque se eiliminan los dos coheficientes