Ola leonardo
7.a
x + 5y = 9
4x + 3y = 19
4x + 20y = 36
17y = 17
y = 1
4x + 3 = 19
4x = 16
x = 4
7.b
3x - 2y = -12
-x + 4y = 24
-3x + 12y = 72
10y = 60
y = 6
-x + 24 = 24
x = 0
8.a
x - 3y + 2z = 7
2x - 5y - 4z = 12
-5x + 3y + z = 1
x = 7 + 3y - 2z
2x = 14 + 6y - 4z
-5x = -35 - 15y + 10z
14 + 6y - 4z - 5y - 4z = 12
y - 8z = -2
-35 - 15y + 10z + 3y + z = 1
-12y + 11z = 36
12y - 96z = -24
-85z = 12
z = -12/85
y = -170/85 - 96/85 = -266/85
x = (7*85 - 3*266 + 24)/85 = -179/85
8b
x + y - z = 1
3x + y - 3z = -1
4x - 6y + z = 9
x = 4, y = 2, z = 5
pronto
ajudo
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Answers & Comments
Ola leonardo
7.a
x + 5y = 9
4x + 3y = 19
4x + 20y = 36
17y = 17
y = 1
4x + 3 = 19
4x = 16
x = 4
7.b
3x - 2y = -12
-x + 4y = 24
-3x + 12y = 72
10y = 60
y = 6
-x + 24 = 24
x = 0
8.a
x - 3y + 2z = 7
2x - 5y - 4z = 12
-5x + 3y + z = 1
x = 7 + 3y - 2z
2x = 14 + 6y - 4z
-5x = -35 - 15y + 10z
2x - 5y - 4z = 12
14 + 6y - 4z - 5y - 4z = 12
y - 8z = -2
-5x + 3y + z = 1
-35 - 15y + 10z + 3y + z = 1
-12y + 11z = 36
y - 8z = -2
12y - 96z = -24
-85z = 12
z = -12/85
y = -170/85 - 96/85 = -266/85
x = 7 + 3y - 2z
x = (7*85 - 3*266 + 24)/85 = -179/85
8b
x + y - z = 1
3x + y - 3z = -1
4x - 6y + z = 9
x = 4, y = 2, z = 5
pronto
ajudo