+3a*x_{2}=4-91,x_{1}=2

解答

+ 3 a \cdot x_{2} = 4 - 91, x_{1} = 2

x_{1} = 2, x_{2} = - \frac{29}{a}, a \neq = 0

求解步骤

[3 a x_{2} = 4 - 91 x_{1} = 2]

[3 a x_{2} = 4 - 91]

化简

[3 a x_{2} = - 87]

对于

3 a x_{2} = - 87

将

x_{2}

移到一边:

x_{2} = - \frac{29}{a}; a \neq = 0

方程组的解为:

x_{1} = 2, x_{2} = - \frac{29}{a}, a \neq = 0

3 x + 3 y + z = 3, 3 y - z = 2

2 (2 x - 4) + y = 3, - x + 2 y = 4

3 x - 4 y = 6, x + 2 y = 8

b \cdot m + n + r = 3, 2 m - n + r = 2, 3 m + 3 n - r = 5

3 m - 2 n = - 2, 6 m + 4 n = - 20