1. **State the problem:** Solve the system of equations by graphing:
$$3x + y = 3$$
$$3x - y = 3$$
2. **Rewrite each equation in slope-intercept form $y = mx + b$:**
For the first equation:
$$3x + y = 3 \implies y = 3 - 3x$$
For the second equation:
$$3x - y = 3 \implies -y = 3 - 3x \implies y = 3x - 3$$
3. **Identify the slopes and intercepts:**
- First line: slope $m_1 = -3$, y-intercept $b_1 = 3$
- Second line: slope $m_2 = 3$, y-intercept $b_2 = -3$
4. **What kind of lines are formed?**
Since $m_1 = -3$ and $m_2 = 3$, the lines have different slopes, so they are **intersecting lines**.
5. **Find the point of intersection by solving the system algebraically:**
Add the two original equations:
$$3x + y = 3$$
$$3x - y = 3$$
Adding:
$$3x + y + 3x - y = 3 + 3 \implies 6x = 6 \implies x = \frac{6}{6} = 1$$
Substitute $x=1$ into the first equation:
$$3(1) + y = 3 \implies 3 + y = 3 \implies y = 0$$
6. **Point of intersection:**
$$\boxed{(1, 0)}$$
7. **Type of system:**
Since the lines intersect at exactly one point, this is a **consistent and independent system**.
8. **Number of solutions:**
There is exactly **one solution** to the system, the point $(1,0)$.
Summary:
- a) The lines are intersecting lines with different slopes.
- b) Yes, there is a point of intersection.
- c) The point of intersection is $(1,0)$.
- d) The system is consistent and independent.
- e) There is exactly one solution.
Solve System 7856E8
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