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Giovanna0031
@Giovanna0031
December 2019
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Resolva os sistemas pelo método da substituição. (me ajudem, urgentemente!!!!!)
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EuSouDoAcre
A)
x-y=3
x=y+3
x+y=11
(y+3)+y=11
2y+3=11
2y=8
y=4
x=y+3
x=4+3
x=7
b)
x+y=6
y=6-x
2x+y=4
2x+(6-x)=4
x+6=4
x=-2
y=6-x
y=6-(-2)
y=6+2
y=8
c)
3x+y=5
y=5-3x
2x+y=4
2x+(5-3x)=4
5-x=4
-x=-1
x=1
y=5-3x
y=5-3
y=2
d)
x-y=6
x=6+y
x+y=-7
(6+y)+y=-7
6+2y=-7
2y=-13
y=-13/2
x=6+y
x=6-13/2
x=-½
e)
x=5-3y
2x-y=-4
2×(5-3y)-y=-4
10-6y-y=-4
10-7y=-4
-7y=-14
-y=-2
y=2
x=5-3y
x=5-3×2
x=5-6
x=-1
f)
x-3=-y
3-x=y
3x+2=y+3
3x=y+1
3x=3-x+1
4x=4
x=1
y=3-x
y=3-1
y=2
1 votes
Thanks 4
Giovanna0031
muito obrigada!!!
EuSouDoAcre
por nada
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x-y=3
x=y+3
x+y=11
(y+3)+y=11
2y+3=11
2y=8
y=4
x=y+3
x=4+3
x=7
b)
x+y=6
y=6-x
2x+y=4
2x+(6-x)=4
x+6=4
x=-2
y=6-x
y=6-(-2)
y=6+2
y=8
c)
3x+y=5
y=5-3x
2x+y=4
2x+(5-3x)=4
5-x=4
-x=-1
x=1
y=5-3x
y=5-3
y=2
d)
x-y=6
x=6+y
x+y=-7
(6+y)+y=-7
6+2y=-7
2y=-13
y=-13/2
x=6+y
x=6-13/2
x=-½
e)
x=5-3y
2x-y=-4
2×(5-3y)-y=-4
10-6y-y=-4
10-7y=-4
-7y=-14
-y=-2
y=2
x=5-3y
x=5-3×2
x=5-6
x=-1
f)
x-3=-y
3-x=y
3x+2=y+3
3x=y+1
3x=3-x+1
4x=4
x=1
y=3-x
y=3-1
y=2