Harper Matthews
02/22/2023 · Junior High School
Find an equation for the line below \( (-4,3)(6,-3) \)
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Step-by-step Solution
To find the equation of the line that passes through the points \((-4,3)\) and \((6,-3)\), we can use the point-slope form of a linear equation:
\[ y - y_1 = m(x - x_1) \]
where \( m \) is the slope of the line and \( (x_1, y_1) \) is one of the points on the line.
First, let's find the slope \( m \) using the two given points:
\[ m = \frac{y_2 - y_1}{x_2 - x_1} \]
Substituting the coordinates of the points:
\[ m = \frac{-3 - 3}{6 - (-4)} \]
\[ m = \frac{-6}{6 + 4} \]
\[ m = \frac{-6}{10} \]
\[ m = -\frac{3}{5} \]
Now that we have the slope, we can use either of the two points to write the equation in point-slope form. Let's use the point \((-4,3)\):
\[ y - 3 = -\frac{3}{5}(x - (-4)) \]
\[ y - 3 = -\frac{3}{5}(x + 4) \]
To get the equation in slope-intercept form \( y = mx + b \), we can distribute the slope and simplify:
\[ y - 3 = -\frac{3}{5}x - \frac{3}{5} \cdot 4 \]
\[ y - 3 = -\frac{3}{5}x - \frac{12}{5} \]
Now, add 3 to both sides to isolate \( y \):
\[ y = -\frac{3}{5}x - \frac{12}{5} + 3 \]
\[ y = -\frac{3}{5}x - \frac{12}{5} + \frac{15}{5} \]
\[ y = -\frac{3}{5}x + \frac{3}{5} \]
So, the equation of the line in slope-intercept form is:
\[ y = -\frac{3}{5}x + \frac{3}{5} \]
Quick Answer
The equation of the line is \( y = -\frac{3}{5}x + \frac{3}{5} \).
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