## Math Problem Statement

## Solution

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## Math Problem Analysis

### Mathematical Concepts

Algebra

Simultaneous Equations

### Formulas

y = 3 - x (derived from x + y = 3)

### Theorems

Substitution method

### Suitable Grade Level

Grades 8-10

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Solving the System of Equations: x + y = 4 and y = 3x using Substitution