a) x+y=-6
x-y=1
b) 2x-5y=3
x-y=-1
metodo de adiçao
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II) X-Y= 1
2X= -5 => X= -5/2
aplic. x em 1)
I) X+Y=-6 => -5/2 + Y= -6
Y=-6+5/2
Y = (-12+5)/2 = -7/2
S={X= -5/2 , Y= -7/2}
b) I) 2x-5y=3 I) 2x-5y=3
II) x - y =-1 mut. p/ (-5) II) -5x+5y=+5
-3x = 8
x= - 8/3 aplic. X em I)
2X-5Y=3 , P/ X=-8/3
2(-8/3) -5Y =3
-16/3 - 5Y = 3
-5Y = 3+16/3
-5Y = (9+16)/3
-5Y = 25/3
Y= - 25/15 SIMPLIFICANDO POR 5
Y = - 5/3
S={X=-8/3 ,Y= -5/3}