Respostas
1. - 4x - 4y - 3z = 27 ⇔
⇔ 4 × (3p) - 4 × (-5) - 3 × (p - 2) = 27 ⇔
⇔ 12p - (-20) - (3p - 6) = 27 ⇔
⇔ 12p + 20 - 3p + 6 = 27 ⇔
⇔ 12p - 3p = 27 - 20 - 6 ⇔
⇔ 9p = 1 ⇔
⇔ p = 1/9
2. -
3x - y = 7 y = 3x - 7 y = 3x - 7
a) ⇔ ⇔ ⇔
2x + 4y = -1 2x = -1 - 4 × (3x - 7) 2x = -1 - 12x + 28
y = 3x - 7 y = 3x - 7 y = 3 × (27/14) - 7
⇔ ⇔ ⇔ ⇔
2x + 12x = 27 14x = 27 x = 27/14
y = 81/14 - (98/14) y = -17/14
⇔ ⇔ (x ; y) = (27/14 ; -17/14)
x = 27/14 x = 27/14
O sistema é determinado
x - y + z = 1 x = 1 + y - z
b) 2x + 3y - 2z = -2 ⇔ 3y = -2 - 2x + 2z ⇔
x - 2y + 5z = 4 5z = 4 - x + 2y
x = 1 + y - z x = 1 + y - z
⇔ 3y = -2 - 2 × (1 + y - z) + 2z ⇔ 3y = -2 - 2 - 2y + 2z + 2z ⇔
5z = 4 - (1 + y - z) + 2y 5z = 4 - 1 - y + z + 2y
x = 1 + y - z x = 1 + y - z x = 1 + y - z
⇔ 3y = -4 - 2y + 4z ⇔ 3y + 2y = -4 + 4z ⇔ y = -4/5 + 4z/5 ⇔
5z = 3 + y + z 5z - z = 3 + y z = 3/4 + y/4
x = 1 + y - z x = 1 + y - z
⇔ y = -4/5 + 4 × (3/4 + y/4) ÷ 5 ⇔ y = -4/5 + (3 + y) ÷ 5 ⇔
z = 3/4 + y/4 z = 3/4 + y/4
x = 1 + y - z x = 1 + y - z
⇔ y = -4/5 + (3 + y) ÷ 5 ⇔ y = -4/5 + 3/5 + y/5 ⇔
z = 3/4 + y/4 z = 3/4 + y/4
x = 1 + y - z x = 1 + y - z x = 1 + y - z
⇔ y = -1/5 + y/5 ⇔ 5y/5 - y/5 = -1/5 ⇔ 4y/5 = -1/5 ⇔
z = 3/4 + y/4 z = 3/4 + y/4 z = 3/4 + y/4
x = 1 + y - z x = 1 + y - z x = 1 + y - z
⇔ 4y = -1 ⇔ y = -1/4 ⇔ y = -1/4 ⇔
z = 3/4 + y/4 z = 3/4 + (-1/4) ÷ 4 z = 3/4 - 1/16
x = 1 + y - z x = 1 + y - z x = 1 + (-1/4) - (11/16)
⇔ y = -1/4 ⇔ y = -1/4 ⇔ y = -1/4 ⇔
z = 12/16 - 1/16 z = 11/16 z = 11/16
x = 16/16 - 4/16 - 11/16 x = 1/16
⇔ y = -1/4 ⇔ y = -1/4 (x ; y ; z) = (1/16 ; -1/4 ; 11/16)
z = 11/16 z = 11/16
O sistema é determinado
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