Question: In Exercises 1-4, use Theorem 4.12 to compute the inverse of the coefficient matrix for the given exercise. 1. Exercise 57 x + y =

In Exercises 1-4, use Theorem 4.12 to compute the inverse of the coefficient matrix for the given exercise.
1. Exercise 57
x + y = 1
x - y = 2
2. Exercise 58
2x - y = 5
x + 3y = - 1
3. Exercise 59
2x + y + 3z = 1
y + z = 1
z = 1
4. Exercise 60
x + y - z = 1
x + y + z = 2
x - y = 3

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