Bounded Area 3C85B2
1. **State the problem:** We are given two linear equations and a value for $x$:
$$x + 13 + y = 0$$
$$x + 3y + 2 = 0$$
$$x = 1$$
We need to find the area bounded by these lines.
2. **Rewrite the equations:**
From the first equation:
$$y = -x - 13$$
From the second equation:
$$x + 3y + 2 = 0 \implies 3y = -x - 2 \implies y = -\frac{x}{3} - \frac{2}{3}$$
The third equation is a vertical line:
$$x = 1$$
3. **Find the points of intersection:**
- Intersection of the two lines:
Set $y$ equal:
$$-x - 13 = -\frac{x}{3} - \frac{2}{3}$$
Multiply both sides by 3:
$$-3x - 39 = -x - 2$$
Bring all terms to one side:
$$-3x + x = -2 + 39$$
$$-2x = 37$$
$$x = -\frac{37}{2} = -18.5$$
Find $y$:
$$y = -(-18.5) - 13 = 18.5 - 13 = 5.5$$
So intersection point is $A(-18.5, 5.5)$.
- Intersection of first line and $x=1$:
$$x=1$$
$$y = -1 - 13 = -14$$
Point $B(1, -14)$.
- Intersection of second line and $x=1$:
$$x=1$$
$$y = -\frac{1}{3} - \frac{2}{3} = -1$$
Point $C(1, -1)$.
4. **Calculate the area of the triangle formed by points $A$, $B$, and $C$:**
Use the formula for area of triangle given coordinates:
$$\text{Area} = \frac{1}{2} \left| x_1(y_2 - y_3) + x_2(y_3 - y_1) + x_3(y_1 - y_2) \right|$$
Let $A(x_1,y_1) = (-18.5, 5.5)$, $B(x_2,y_2) = (1, -14)$, $C(x_3,y_3) = (1, -1)$:
$$\text{Area} = \frac{1}{2} | -18.5(-14 + 1) + 1(-1 - 5.5) + 1(5.5 + 14) |$$
Calculate inside:
$$-14 + 1 = -13$$
$$-1 - 5.5 = -6.5$$
$$5.5 + 14 = 19.5$$
So:
$$\text{Area} = \frac{1}{2} | -18.5 \times (-13) + 1 \times (-6.5) + 1 \times 19.5 |$$
$$= \frac{1}{2} | 240.5 - 6.5 + 19.5 | = \frac{1}{2} | 253.5 | = 126.75$$
5. **Final answer:**
The area bounded by the lines is **126.75** square units.