The uploaded file contains a mathematical explanation of solving systems of equations and inequalities in Russian. It includes:

1. Solution of a linear system using substitution (finding a solution for $\begin{cases} 3x + 4y = 5 \\ 5x = 13 \end{cases}$).
2. Tasks to solve systems of equations using:
   • The substitution method.
   • The elimination (addition) method.
3. Inequalities: Solving a system of inequalities step by step and finding their intersection.

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5 Possible Questions Related to the Content:

1. How does the substitution method work for solving systems of equations?
2. Can you explain the addition (elimination) method in more detail with examples?
3. How do you find the solution set of inequalities step by step?
4. What are the key differences between solving equations and inequalities?
5. Could you elaborate on how intersections of solution sets for inequalities are determined?

Tip:

When solving inequalities, always pay attention to how dividing or multiplying by a negative number affects the inequality sign!