In Exercises 1-3, solve the systems of linear equations over the indicated 1. x + 2y =

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In Exercises 1-3, solve the systems of linear equations over the indicated
1. x + 2y = 1 over
x + y = 2
2. x + y = 1 over
y + z = O
x + z = 1
3. x + y = 1 over
y + z = O
x + z = 1
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