Use back-substitution to solve the system of linear equations. 1. 2. 4y + 3z 3 %3D

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Use back-substitution to solve the system of linear equations.
1.
4y + 3z 3 х %3D у — г 3 z = -5 y

2.

(x – 7y + 8z 85 y 9z = 35 3 || ||
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