I need help solving these questions. I am so lost with these last questions that I need to do. Does anyone no how to do them or help me start them.
1)
x - y + z = -11
x + y + z = -5
x + y - z = 1
2) Evaluate the determinant
1/8 1/7
-5/9 5/6
3) Use cramers rule
11x + 3y = 1
5x + 2y = 4
4) Evaluate the determinant
6 5 6
1 1 3
2 5 1
5) Use cramer's rule
4x + 3y - z = 12
x - 3y + 3z = 14
3x + y + z = 18
Please help me figure these out or give me an idea of how to do these.
1)
x - y + z = -11
x + y + z = -5
x + y - z = 1
2) Evaluate the determinant
1/8 1/7
-5/9 5/6
3) Use cramers rule
11x + 3y = 1
5x + 2y = 4
4) Evaluate the determinant
6 5 6
1 1 3
2 5 1
5) Use cramer's rule
4x + 3y - z = 12
x - 3y + 3z = 14
3x + y + z = 18
Please help me figure these out or give me an idea of how to do these.