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
2w + x + y + z = 3
−8w − 7x − 3y + 5z = −3
w + 4x + y + z = 6
w + 3x + 7y − z = 1
Let D =
C =
We have to solve for y,
By using Cramer's Rule we have
y =
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 =
On solving, we get D = 424 and Dy = -78
hence y = -78/424
y = -0.184
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