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Biia1211
@Biia1211
December 2019
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Resolva os sistemas abaixo:
A) x+y=32
x-y=18
B) 6x-3y=20
4x+3y=40
C) 7x+6y=23
5x-6y=21
D) -2x-3y=11
2x+7y=1
E) -9x-15y=-90
25z+15y=170
ME AJUDEM POR FAVOR!!
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albertrieben
Boa tarde Bia
A)
x+y=32
x-y=18
2x = 50
x = 25
y = 7
S = (25, 7)
B)
6x-3y=20,
4x+3y=40
10x = 60
x = 6
24 + 3y = 40
3y = 16
y = 16/3
S = (6, 16/3)
C)
7x+6y=23,
5x-6y=21
12x = 44
x = 11/3
55/3 - 6y = 63/3
6y = -8/3
y = -8/18 = -4/9
S = (11/3, -4/9)
D)
-2x-3y=11,
2x+7y=1
4y = 12
y = 3
2x + 21 = 1
2x = -20
x = -10
S = (-10, 3)
E)
-9x-15y=-90,
25x+15y=170
16x = 80
x = 5
-45 -15y = -90
15y = 45
y = 3
S = (5,3)
1 votes
Thanks 2
albertrieben
o 63/3 vem de 21 = 63/3 para subtrair com o 55/3
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A)
x+y=32
x-y=18
2x = 50
x = 25
y = 7
S = (25, 7)
B)
6x-3y=20,
4x+3y=40
10x = 60
x = 6
24 + 3y = 40
3y = 16
y = 16/3
S = (6, 16/3)
C)
7x+6y=23,
5x-6y=21
12x = 44
x = 11/3
55/3 - 6y = 63/3
6y = -8/3
y = -8/18 = -4/9
S = (11/3, -4/9)
D)
-2x-3y=11,
2x+7y=1
4y = 12
y = 3
2x + 21 = 1
2x = -20
x = -10
S = (-10, 3)
E)
-9x-15y=-90,
25x+15y=170
16x = 80
x = 5
-45 -15y = -90
15y = 45
y = 3
S = (5,3)