Question #196881

Use Cramer’s rule to solve for y without solving for x, z and w in the system

2w + x + y + z = 3

−8w − 7x − 3y + 5z = −3

w + 4x + y + z = 6

w + 3x + 7y − z = 1


1
Expert's answer
2021-05-27T05:58:28-0400

2w + x + y + z = 3

−8w − 7x − 3y + 5z = −3

w + 4x + y + z = 6

w + 3x + 7y − z = 1



Let D = 2111873514111371\begin{vmatrix} 2 & 1 & 1 & 1 \\ -8 & -7 & -3 & 5\\ 1&4&1&1\\ 1&3&7&-1\\ \end{vmatrix}


C = 3361\begin{vmatrix} 3 \\ -3 \\ 6 \\ 1 \end{vmatrix}


We have to solve for y,


By using Cramer's Rule we have


y = DyD\dfrac{D_y}{D}



we can find Dy by replacing the 3rd column of D matrix by the solution Matrix C. after doing this, we get

Dy as


Dy = 2131873514611311\begin{vmatrix} 2 & 1 & 3 & 1\\ -8 & -7 & -3 & 5\\ 1 & 4 & 6 & 1\\ 1 & 3 & 1& -1\\ \end{vmatrix}



On solving, we get D = 424 and Dy = -78


hence y = -78/424


y = -0.184



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