Resolva os sistemas pelo método de substituição.
A)X+Y= -2
2X-Y=26.
B)3X-Y=-11
X+2Y=8
C)2X+2Y=4
3X-2Y=1
D)2X+3Y=9
4X-5Y=7
E)X+Y=16
X-Y=2
F)X+5Y= -28
2X+3Y= -7
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A)X+Y= -2
x=-y-2
x=-10-2
x=-12
2X-Y=26
2.(-y-2)-y=26
-2y-4-y=26
-3y-4=26.(-1)
3y=-26-4
Y=-30/3 y=-10
B)3X-Y=-11
3.(8-2y)-y=-11
24-6y-y=-11
-7y=-11-24.(-1)
7y=35
y=35/7 y=5
X+2Y=8
x=8-2y
X=8-2.5
X=8-10 x=-2
C)2X+2Y=4
2x=-2y+4
X=-2y+4/2
X=-y+2
X=-1+2 y=1
3X-2Y=1
3.(-y+2)-2y=1
-3y+6-2y=1
-5y=1-6.(-1)
5y=5
Y=5/5 y=1
E)X+Y=16
X=16-y
X=16-7 x=9
X-Y=2
16-y-y=2
-2y=2-16.(-1)
2y=14
Y=14/2 y=7
F)X+5Y= -28
X=-5y-28
X=-5.(-7)-28
X=35-28 x=7
2X+3Y= -7
2.(-5y-28)+3y=-7
-10y-56+3y=-7
-7y=56-7.(-1)
7y=-49
Y=-49/7 y=-7
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