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Find the area (in sq units) enclosed by ...

Find the area (in sq units) enclosed by y = 0, x+6=0 and 2x-3y=6.

A

9

B

16

C

20

D

27

Text Solution

AI Generated Solution

The correct Answer is:
To find the area enclosed by the lines \( y = 0 \), \( x + 6 = 0 \), and \( 2x - 3y = 6 \), we will follow these steps: ### Step 1: Identify the equations of the lines 1. The first line is \( y = 0 \) (the x-axis). 2. The second line is \( x + 6 = 0 \), which simplifies to \( x = -6 \) (a vertical line). 3. The third line is \( 2x - 3y = 6 \). We can rearrange this to find \( y \) in terms of \( x \): \[ 3y = 2x - 6 \implies y = \frac{2}{3}x - 2 \] ### Step 2: Find the points of intersection Next, we will find the points where these lines intersect. 1. **Intersection of \( y = 0 \) and \( x = -6 \)**: - Substitute \( y = 0 \) into \( x = -6 \): - The point is \( (-6, 0) \). 2. **Intersection of \( y = 0 \) and \( 2x - 3y = 6 \)**: - Substitute \( y = 0 \) into \( 2x - 3(0) = 6 \): - \( 2x = 6 \implies x = 3 \). - The point is \( (3, 0) \). 3. **Intersection of \( x = -6 \) and \( 2x - 3y = 6 \)**: - Substitute \( x = -6 \) into \( 2(-6) - 3y = 6 \): - \( -12 - 3y = 6 \implies -3y = 18 \implies y = -6 \). - The point is \( (-6, -6) \). ### Step 3: Identify the vertices of the enclosed area The vertices of the triangle formed by these intersections are: 1. \( (-6, 0) \) 2. \( (3, 0) \) 3. \( (-6, -6) \) ### Step 4: Calculate the area of the triangle To find the area of the triangle formed by these vertices, we can use the formula: \[ \text{Area} = \frac{1}{2} \times \text{base} \times \text{height} \] Here, the base is the distance between the points \( (-6, 0) \) and \( (3, 0) \), and the height is the vertical distance from the point \( (-6, -6) \) to the x-axis. 1. **Base**: The distance between \( (-6, 0) \) and \( (3, 0) \) is: \[ |3 - (-6)| = 3 + 6 = 9 \] 2. **Height**: The vertical distance from \( (-6, -6) \) to the x-axis (y = 0) is: \[ |-6 - 0| = 6 \] Now, substituting these values into the area formula: \[ \text{Area} = \frac{1}{2} \times 9 \times 6 = \frac{54}{2} = 27 \] ### Final Answer The area enclosed by the lines is \( \boxed{27} \) square units.
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