Question
The line's slope is \( -\frac{1}{4} \) and it passes through the point \( (10,-9) \)
Ask by Donnelly Christensen. in the United States
Jan 24,2025
Real Tutor Solution
Tutor-Verified Answer
Answer
The equation of the line is \( y = -\frac{1}{4}x - 6.5 \).
Solution
To determine the equation of a line given its slope and a specific point it passes through, you can use the **point-slope form** and then convert it to other forms as needed. Here's a step-by-step guide based on the information provided:
- **Slope (m):** \(-\frac{1}{4}\)
- **Point (x₁, y₁):** \((10, -9)\)
### 1. Point-Slope Form
The **point-slope form** of a line is given by:
\[
y - y_1 = m(x - x_1)
\]
**Plugging in the values:**
\[
y - (-9) = -\frac{1}{4}(x - 10)
\]
\[
y + 9 = -\frac{1}{4}x + \frac{10}{4}
\]
\[
y + 9 = -\frac{1}{4}x + 2.5
\]
### 2. Slope-Intercept Form
To express the equation in **slope-intercept form** (\(y = mx + b\)), solve for \(y\):
\[
y = -\frac{1}{4}x + 2.5 - 9
\]
\[
y = -\frac{1}{4}x - 6.5
\]
Alternatively, using fractions:
\[
y = -\frac{1}{4}x - \frac{13}{2}
\]
### 3. Standard Form
The **standard form** of a line is \(Ax + By = C\), where \(A\), \(B\), and \(C\) are integers, and \(A\) is non-negative.
Starting from the slope-intercept form:
\[
y = -\frac{1}{4}x - 6.5
\]
Multiply every term by 4 to eliminate the fraction:
\[
4y = -x - 26
\]
Rearrange to standard form:
\[
x + 4y = -26
\]
### Summary of the Equation in Different Forms
1. **Point-Slope Form:**
\[
y + 9 = -\frac{1}{4}(x - 10)
\]
2. **Slope-Intercept Form:**
\[
y = -\frac{1}{4}x - 6.5
\]
or
\[
y = -\frac{1}{4}x - \frac{13}{2}
\]
3. **Standard Form:**
\[
x + 4y = -26
\]
You can use any of these forms depending on the context or the specific requirements of your problem.
Reviewed and approved by the UpStudy tutoring team
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Mind Expander
To find the equation of the line, we use the point-slope form, which is \( y - y_1 = m(x - x_1) \). Here, \( m \) is the slope, \( (x_1, y_1) \) is the given point. Plugging the values in, we have \( y - (-9) = -\frac{1}{4}(x - 10) \). Simplifying this will give us a neat linear equation. Now that you have the equation, a real-world application could be finding the trajectory of a car moving down a hill. If the slope represents a steep decline, you could use that information to predict the speed of the car based on how steeply the hill descends over distance!