Resolva os sistemas por escalonamento
A) × - 3y = 15
2× + 6y = 18
B) 2× + 5y = 15
× + 6y = 18
C) 2× + 5y = 30
× + 6y = 36
D) 7× -y = 4
× + 2y = -8
E) × - 2y = 4
× + 2y = -8
F) × - 3y = 8
× + 2y = 5
G) 7× - 2y = 14
× + 3y = - 21
H) -5× - 4y = 18
× + 2y = - 14
I) × - 4y = 16
× + 2y = - 14
J) 4 + y = 8
2× + y = 6
K) 4× +1y = - 12
2×+ 3y = 14
L) 6× - y = 22
× - 2y = - 11
M) 2× - 3y =23
4× + 5y = 23
N) 2×-3y = - 13
4× + 5y = 7
O) 2× -3y = - 31
2× - 7y = - 67
P) 7× - 3y = 4
2× - 5y = 26
Q) -7× - 3y = 4
- 2× + 2y = 4
R) -7× + 3y = 48
-2× + 7y = 69
S) 7× + 3y = 6
3× + 2y = 9
T) - 5× - 3y =8
3× + 5y = - 8
U) -2× +y -4z = 10
2× +y - 3z = 9
4× + y + 2z = 4
V) -2×u -4z = 10
2× + y - 3z = 9
4× + y + 2z = 4
W) -2× + y - 4z = 10
2× + y - 3z = - 3
4× + y + 2z =4
X) -2× + 2y - 4z = 8
2× + 2y - 3z =15
4× + 2y + 2z = - 4
ME AJUDA POR FAVOR É TRABALHO DE FALTAS DE MATEMATICA AJUDA POR FAVOR??????????
Soluções para a tarefa
A) × - 3y = 15 .
(-2)
2× + 6y = 18
-2× + 6y
= -30
2× + 6y
= 18
12y = -12
y = -1
× - 3.(-1) = 15
x + 3 = 15
x = 12
B) 2× + 5y = 15
× + 6y =
18 .(-2)
2× + 5y = 15
-2× - 12y = -36
- 7y = -21
y = 3
x + 6.3 = 18
x + 18 = 18
x = 0
C) 2× + 5y = 30
× + 6y = 36 .(-2)
2× + 5y = 30
-2× - 12y = -72
-7y = -42
y = 6
x + 6.6 = 36
x + 36 = 36
x = 0
D) 7× - y = 4
× + 2y = -8 . (-7)
7× -
y = 4
-7× - 14y = 56
-15y = 60
y = 60/(-15)
y = -4
x + 2.(-4) = -8
x - 8 = -8
x = 0
E) × - 2y = 4
× + 2y = -8
2x = -4
x = -2
-2 – 2y = 4
-2y = 4 + 2
-2y = 6
Y = -3
F) × - 3y = 8
× + 2y = 5 .(-1)
× - 3y = 8
-× - 2y = -5
-5y = 3
y = -(-3/5)
G) 7× - 2y = 14
× + 3y = - 21 .(-7)
7× - 2y = 14
-7× - 21y = 147
- 23y = 161
y = -7
x + 3.(-7) = -21
x -21 = -21
x = 0
H) -5× - 4y = 18
× + 2y = - 14 .(5)
-5× - 4y = 18
5× + 10y = - 70
6y = - 52
y = - (26/3)
x + 2 . (-26/3) = 14
x - = 14
x = 14 +
x = =
I) × - 4y = 16
× + 2y = - 14 . (-1)
× - 4y = 16
-× - 2y = 14
-6y = 30
y = -5
x – 4.(-5) = 16
x + 20 = 16
x = 16 – 20
x = -4
J) 4 + y = 8
2× + y = 6 . (-1)
4 + y =
8
-2× - y = -6
4 -2x = 2
-2x = 2 -4 = -2
x = 1
y = 4
K) 4× +1y = - 12
2× + 3y = 14 . (-2)
4× +1y = - 12
-4× - 6y = - 28
- 5y = -40
y = 8
4x + 8 = -12
4x = -12 -8 = -20
x = 5
L) 6× - y = 22
× - 2y = - 11 .(-6)
6× - y = 22
-6× + 12y = 22
11y = 22
y = 2
6x – 2 = 22
6x = 22 + 2 = 24
x = 4
M) 2× - 3y =23 . (-2)
4× + 5y = 23
-4× + 6y = -46
4× + 5y = 23
11y = -23
y =
2x – 3 . (-23/11) = 23
2x + (69/11) = 23
2x = 23 -
22x = 184
x =
N) 2×- 3y = - 13 .(-2)
4× + 5y = 7
-4× + 6y = 26
4× + 5y = 7
11y = 33
y = 3
2×- 3.3 = - 13
2x = -13 + 9 = -4
x = -2
O) 2× - 3y = - 31
2× - 7y = - 67 . (-1)
2× - 3y = - 31
-2× + 7y = 67
4y = 36
y = 9
2× - 3.9 = - 31
2x – 27 = -31
2x = -31 + 27 = -4
x = -2
P) 7× - 3y = 4 .(2)
2× - 5y = 26 .(-7)
14× - 6y = 8
-14× + 35y = -182
29y = -186
y =
7× - 3. = 4
7x + =4
203x = 116 – 558 = -442
x =
Q) -7× - 3y = 4 .(2)
- 2× + 2y = 4 .(3)
-14× - 6y = 8
- 6× + 6y = 12
-20x = 20
x = -1
-7(-1) - 3y = 4
7 – 3y = 4
-3y = 4 – 7 = -3
y = 1
R) -7× + 3y = 48 .(-2)
-2× + 7y = 69 .(7)
14× - 6y = -96
-14× + 49y = 483
43y = 387
y = 9
-7× + 3.9 = 48
-7x + 27 = 48
-7x = 48 – 27 = 21
x = -3
S) 7× + 3y = 6 .(2)
3× + 2y = 9 .(-3)
14× + 6y = 12
-9× - 6y = -27
5x
= -15
x = -3
3.(-3) + 2y = 9
-9 + 2y = 9
2y = 9 + 9 = 18
y = 9
T) - 5× - 3y = 8 .(3)
3× + 5y = - 8 . (5)
- 15× - 9y = 24
15× + 25y = - 40
16y = -16
y = -1
- 5× - 3.(-1) = 8
-5x +3 = 8
-5x = 8 – 3 = 5
x = -1
U) -2× +y -4z = 10
2× +y - 3z = 9
4× + y + 2z = 4
-2× +y - 4z = 10 .(2)
2y - 7z = 19
4× + y + 2z = 4
-2× +y - 4z = 10
2y - 7z = 19 .(3)
3y - 6z = 24 .(-2)
-2× +y - 4z = 10
2y - 7z = 19
15z = 9