Question: In Exercises 1-4, use Cramer's Rule to solve the given linear system. 1. x + y = 1 x - y = 2 2. 2x

In Exercises 1-4, use Cramer's Rule to solve the given linear system.
1. x + y = 1
x - y = 2
2. 2x - y = 5
x + 3y = - 1
3. 2x + y + 3z = 1
y + z = 1
z = 1
4. x + y - z = 1
x + y + z = 2
x - y = 3

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