Question
Use Cramer's Rule to solve the system.
4x − y = −17
3x + 3z = −18
4y + 8z = −12
4x − y = −17
3x + 3z = −18
4y + 8z = −12
Answers
oobleck
D =
|4 -1 0|
|3 0 3|
|0 4 8|
Dx =
|-17 -1 0|
|-18 0 3|
|-12 4 8|
Dy =
|4 -17 0|
|3 -18 3|
|0 -12 8|
Dz =
|4 -1 -17|
|3 0 -18|
|0 4 -12|
Now,x = Dx/D, y = Dy/D, z = Dz/D
Post your work if
(a) you get stuck
(b) you do not get (-4,1,-2)
|4 -1 0|
|3 0 3|
|0 4 8|
Dx =
|-17 -1 0|
|-18 0 3|
|-12 4 8|
Dy =
|4 -17 0|
|3 -18 3|
|0 -12 8|
Dz =
|4 -1 -17|
|3 0 -18|
|0 4 -12|
Now,x = Dx/D, y = Dy/D, z = Dz/D
Post your work if
(a) you get stuck
(b) you do not get (-4,1,-2)