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Beatrizcella
@Beatrizcella
October 2019
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Resolva os sistemas: x+y=1 x-y=7
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joaopedroapp6ayoq
X + y = 1
x - y = 7 => x = 7+y
(7+y) +y = 1
2y = -6
y = -3
x - 3 = 1
x = 4
1 votes
Thanks 2
Eumesma1998
X+Y=1
X-Y=7
isolando X: X= 1 - Y
Substituindo:
(1-Y)-Y= 7
1-2Y=7
-2Y=7-1
-2Y= 6 *(-1)
2Y=-6
Y=-6/2
Y=-3
X + (-3)=1
X-3= 1
X= 3+1
X=4
1 votes
Thanks 3
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x - y = 7 => x = 7+y
(7+y) +y = 1
2y = -6
y = -3
x - 3 = 1
x = 4
X-Y=7
isolando X: X= 1 - Y
Substituindo:
(1-Y)-Y= 7
1-2Y=7
-2Y=7-1
-2Y= 6 *(-1)
2Y=-6
Y=-6/2
Y=-3
X + (-3)=1
X-3= 1
X= 3+1
X=4