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belltorresteixeira
@belltorresteixeira
April 2022
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resolver no método de ADIÇÃO
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fagnerdi
X+y=-7
x-y=6
2x=-1
x=-1/2
x+y=-7 (-1)
x-y=6
-x-y=+7
x-y=6
-2y=13
2y=-13
y=-13/2
B)
m+n=4 *(-1)
3m+n=2
-m-n=-4
3m+n=2
2m=-2
m=-2/2
m=-1
m+n=4 *(-3)
3m+n=2
-3m-3n=-12
3m+n=2
-2n=-10 (-1)
2n=10
n=10/2
n=5
1 votes
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belltorresteixeira
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x-y=6
2x=-1
x=-1/2
x+y=-7 (-1)
x-y=6
-x-y=+7
x-y=6
-2y=13
2y=-13
y=-13/2
B)
m+n=4 *(-1)
3m+n=2
-m-n=-4
3m+n=2
2m=-2
m=-2/2
m=-1
m+n=4 *(-3)
3m+n=2
-3m-3n=-12
3m+n=2
-2n=-10 (-1)
2n=10
n=10/2
n=5