Resolva o sistema da equação
a) 3x+2y=6
-3x+2y=6
b) 3x+y=1
-x-y=1
c) 4x+y=6
-5x-y=-1
d) -5x+y=6
-5x+y=-2
e) 6y-x=2
-6y-x=0
f) 6x+y=-2
x-y=+9
g) 176x+y=5
-176x+y=-4
h) x+y=2
-x+y=2
i) x+y=64
9x-y=-4
Respostas
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3x - 3x + 2y +2y = 6 + 6 y = 3
0x + 4y = 12 3x +2y = 6
4y = 12 3x + 2 . 3 = 6
y = 12/4 3x + 6 = 6
y = 3 3x = 6 - 6
3x = 0 x = 0
3x - x + y - y = 1 + 1 x = 1 3x + y = 1
2x +0y = 2 3 . 1 + y = 1
2x = 2 3 + y = 1
x = 2/2 y = 1 - 3
x = 1 y = -2
4x - 5x + y - y = 6 - 1 x = -5 4x + y = 6
- x +0y = 5 4 . (-5) + y = 6
x = - 5 - 20 + y = 6
y = 6 +20
y = 26
-5x + y = 6 . (-1)
5x - y = -6
5x - 5x -y +y = -6 -2
0x + 0y = -8
6y - 6y -x -x = 2 +0 x = -1 6y - x = 2
0y -2x = 2 6y - (-1) = 2
-2x =2 6y + 1 = 2
x =-2/2 6y = 2 -1
x = -1 6y = 1
y = 1/6
6x + x +y -y = -2 +9 x = 1 6x +y = -2
7x +0y = +7 6 .1 + y = -2
7x = 7 6 + y = -2
x = 7/7 y = -2 -6
x = 1 y = -8
176x - 176x +y +y = 5 - 4 y = 1/2 176x +y = 5
0x +2y = 1 176x +1/2 = 5
2y = 1 176x = 5 - 1/2
y = 1/2 352x/2 = 10/2 - 1/2
352x/2 = 9/2
x = 9/352
x -x +y +y = 2 + 2 y = 2 x + y = 2
0x +2y = 4 X + 2 = 2
2y = 4 x = 2 - 2
y = 4/2 x = 0
y = 2
x +9x +y -y = 64 -4 x = 6 x + y = 64
10x + 0y = 60 6 + y = 64
10x = 60 y = 64 - 6
x = 60/10 y = 58
x = 6
0x + 4y = 12 3x +2y = 6
4y = 12 3x + 2 . 3 = 6
y = 12/4 3x + 6 = 6
y = 3 3x = 6 - 6
3x = 0 x = 0
3x - x + y - y = 1 + 1 x = 1 3x + y = 1
2x +0y = 2 3 . 1 + y = 1
2x = 2 3 + y = 1
x = 2/2 y = 1 - 3
x = 1 y = -2
4x - 5x + y - y = 6 - 1 x = -5 4x + y = 6
- x +0y = 5 4 . (-5) + y = 6
x = - 5 - 20 + y = 6
y = 6 +20
y = 26
-5x + y = 6 . (-1)
5x - y = -6
5x - 5x -y +y = -6 -2
0x + 0y = -8
6y - 6y -x -x = 2 +0 x = -1 6y - x = 2
0y -2x = 2 6y - (-1) = 2
-2x =2 6y + 1 = 2
x =-2/2 6y = 2 -1
x = -1 6y = 1
y = 1/6
6x + x +y -y = -2 +9 x = 1 6x +y = -2
7x +0y = +7 6 .1 + y = -2
7x = 7 6 + y = -2
x = 7/7 y = -2 -6
x = 1 y = -8
176x - 176x +y +y = 5 - 4 y = 1/2 176x +y = 5
0x +2y = 1 176x +1/2 = 5
2y = 1 176x = 5 - 1/2
y = 1/2 352x/2 = 10/2 - 1/2
352x/2 = 9/2
x = 9/352
x -x +y +y = 2 + 2 y = 2 x + y = 2
0x +2y = 4 X + 2 = 2
2y = 4 x = 2 - 2
y = 4/2 x = 0
y = 2
x +9x +y -y = 64 -4 x = 6 x + y = 64
10x + 0y = 60 6 + y = 64
10x = 60 y = 64 - 6
x = 60/10 y = 58
x = 6
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