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Given that the matrix [2,-2,16|-4], [-1,0,-3|5],[1,-1,8|-2] can be reduced (using elementary row operations) to the equivalent linear system [1,0,3|-5],[0,1,-5|-3],[0,0,0|0],solve the following system of linear equations {2x−2y+16z = −4, −x−3z = 5, x−y+8z = −2. If necessary, parametrise your answer using the free variables of the system. (You must set the right-most non-leading variable to t if using a single parameter, and if a second parameter is required, then set it to s.)

Question

Given that the matrix [2,-2,16|-4], [-1,0,-3|5],[1,-1,8|-2] can be reduced (using elementary row operations) to the equivalent linear system [1,0,3|-5],[0,1,-5|-3],[0,0,0|0],solve the following system of linear equations {2x−2y+16z = −4, −x−3z = 5, x−y+8z = −2. If necessary, parametrise your answer using the free variables of the system. (You must set the right-most non-leading variable to t if using a single parameter, and if a second parameter is required, then set it to s.)

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Solution

首先,我们可以看到这个矩阵已经被化简为了简化行梯阵形式。这个形式的矩阵可以直接转化为线性方程组,即:

1x + 0y + 3z = -5 0x + 1y - 5z = -3 0x + 0y + 0z = 0

这个方程组可以进一步简化为:

x + 3z = -5 y - 5z = -3

由于第三个方程没有未知数,我们可以忽略它。然后,我们可以将第一个方程中的z用t表示,即z = t。然后我们可以将z代入第一个和第二个方程,得到:

x = -5 - 3t y = -3 + 5t

所以,解为:x = -5 - 3t,y = -3 + 5t,z = t。如果需要第二个参数,我们可以将t设为s。

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