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Solve using Cramer's Rule. x+y+z=8 x-y+z=2 2x + z = 9

          Solve using Cramer's Rule.
x+y+z=8
x-y+z=2
2x + z = 9
        
Solve using Cramer's Rule.
x+y+z=8
x-y+z=2
2x + z = 9

Added by Carolina G.

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Precalculus with Limits
Precalculus with Limits
Ron Larson 2nd Edition
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Solve using Cramer's Rule. x+y+z=8 x-y+z=2 2x+z=9 olve using Cramer's Rule x+y+z=8 x-y+z=2 2x 6=z+
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Transcript

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00:01 We can find the solution to the system of linear equations by finding x as dx over d, and y is d y is d y over d.
00:07 So first, we will find the value of d, and the matrix is going to look like this, using our coefficients from the two variables.
00:15 So that will give us 2 times 1 over 2 minus negative 1 times 1, which will be just 1 plus 1, so our d value is going to be 2.
00:24 Then our dx matrix will be the same as this original 1, except the first column is replaced with the answers from these two equations.
00:31 And so the value for that will be negative 1 times 1 over 2 minus negative 1 times 3 over 2...
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