1. **State the problem:** Classify each system of linear equations as consistent dependent, consistent independent, or inconsistent, and find the solution if it exists.
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### System A
2. **Equations:**
$$y = -\frac{1}{2}x - 3$$
$$y = -\frac{1}{2}x - 2$$
3. **Analyze slopes and intercepts:** Both lines have the same slope $-\frac{1}{2}$ but different y-intercepts ($-3$ and $-2$).
4. **Interpretation:** Lines with the same slope but different intercepts are parallel and never intersect.
5. **Conclusion:** The system is **inconsistent**.
6. **Solution:** No solution.
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### System B
7. **Equations:**
$$y = \frac{3}{2}x + 3$$
$$-3x + 2y = 6$$
8. **Rewrite second equation in slope-intercept form:**
$$-3x + 2y = 6 \implies 2y = 3x + 6 \implies y = \frac{3}{2}x + 3$$
9. **Compare equations:** Both lines are identical.
10. **Interpretation:** The system is **consistent dependent**.
11. **Solution:** Infinitely many solutions (all points on the line).
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### System C
12. **Equations:**
$$y = -x + 1$$
$$y = \frac{1}{2}x - \frac{7}{2}$$
13. **Set equations equal to find intersection:**
$$-x + 1 = \frac{1}{2}x - \frac{7}{2}$$
14. **Solve for $x$:**
$$-x - \frac{1}{2}x = -\frac{7}{2} - 1$$
$$-\frac{3}{2}x = -\frac{9}{2}$$
15. **Divide both sides by $-\frac{3}{2}$:**
$$x = \frac{-\frac{9}{2}}{-\frac{3}{2}} = \cancel{\frac{9}{2}} \times \frac{2}{3} = 3$$
16. **Find $y$ by substituting $x=3$ into first equation:**
$$y = -3 + 1 = -2$$
17. **Conclusion:** The system is **consistent independent** with a unique solution.
18. **Solution:** $(3, -2)$
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**Final answers:**
- System A: inconsistent, no solution.
- System B: consistent dependent, infinitely many solutions.
- System C: consistent independent, unique solution $(3, -2)$.
Linear Systems 33Dd86
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