What do the following two equations represent? • 5z +y = 3 • 10x + 2y = -6 %3D Choose 1 answer: A The same line B Distinct parallel lines

Elementary Geometry For College Students, 7e
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ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
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### Understanding Linear Equations and Their Graphical Representations

**Question:**
What do the following two equations represent?
- \(5x + y = 3\)
- \(10x + 2y = -6\)

**Choose 1 answer:**
- **A) The same line**
- **B) Distinct parallel lines**
- **C) Perpendicular lines**
- **D) Intersecting, but not perpendicular lines**

#### Explanation:

**Option Analysis:**

- **Option A: The same line** 
  - This would mean that the equations represent the same line. However, in order to represent the same line, the second equation should be a multiple of the first. In this case, the second equation is not a simple multiple of the first due to the difference in the constant terms.

- **Option B: Distinct parallel lines**
  - For lines to be distinct and parallel, they must have the same slope but different y-intercepts. Let's convert both equations to slope-intercept form \(y = mx + b\):
    - \(5x + y = 3\) converts to \(y = -5x + 3\)
    - \(10x + 2y = -6\) simplifies to \(2y = -10x - 6\) which further converts to \(y = -5x - 3\)
  - Here, both lines have the same slope \(m = -5\) but different y-intercepts (\(y\)-intercepts are 3 and -3 respectively).

- **Option C: Perpendicular lines**
  - Perpendicular lines have slopes that are negative reciprocals of each other, which is not the case here as both slopes are \(-5\).

- **Option D: Intersecting, but not perpendicular lines**
  - This would imply that the lines intersect at one point with different slopes. Given that both lines have the same slope, they do not intersect at a single point but rather are parallel.

**Conclusion:**
The correct answer is **B) Distinct parallel lines** as shown by the identical slopes and different y-intercepts of the equations.
Transcribed Image Text:### Understanding Linear Equations and Their Graphical Representations **Question:** What do the following two equations represent? - \(5x + y = 3\) - \(10x + 2y = -6\) **Choose 1 answer:** - **A) The same line** - **B) Distinct parallel lines** - **C) Perpendicular lines** - **D) Intersecting, but not perpendicular lines** #### Explanation: **Option Analysis:** - **Option A: The same line** - This would mean that the equations represent the same line. However, in order to represent the same line, the second equation should be a multiple of the first. In this case, the second equation is not a simple multiple of the first due to the difference in the constant terms. - **Option B: Distinct parallel lines** - For lines to be distinct and parallel, they must have the same slope but different y-intercepts. Let's convert both equations to slope-intercept form \(y = mx + b\): - \(5x + y = 3\) converts to \(y = -5x + 3\) - \(10x + 2y = -6\) simplifies to \(2y = -10x - 6\) which further converts to \(y = -5x - 3\) - Here, both lines have the same slope \(m = -5\) but different y-intercepts (\(y\)-intercepts are 3 and -3 respectively). - **Option C: Perpendicular lines** - Perpendicular lines have slopes that are negative reciprocals of each other, which is not the case here as both slopes are \(-5\). - **Option D: Intersecting, but not perpendicular lines** - This would imply that the lines intersect at one point with different slopes. Given that both lines have the same slope, they do not intersect at a single point but rather are parallel. **Conclusion:** The correct answer is **B) Distinct parallel lines** as shown by the identical slopes and different y-intercepts of the equations.
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