Questions: Use two points on the given graph of a line to find the equation of the line in standard form.
Transcript text: Use two points on the given graph of a line to find the equation of the line in standard form.
Solution
Solution Steps
Step 1: Identify Two Points on the Line
From the graph, we can identify two points on the line. Let's choose the points (-6, 6) and (0, -2).
Step 2: Calculate the Slope (m)
The slope \( m \) of a line passing through two points \((x_1, y_1)\) and \((x_2, y_2)\) is given by:
\[ m = \frac{y_2 - y_1}{x_2 - x_1} \]
Substituting the points (-6, 6) and (0, -2):
\[ m = \frac{-2 - 6}{0 - (-6)} = \frac{-8}{6} = -\frac{4}{3} \]
Step 3: Use Point-Slope Form to Find the Equation
The point-slope form of the equation of a line is:
\[ y - y_1 = m(x - x_1) \]
Using the point (0, -2) and the slope \( m = -\frac{4}{3} \):
\[ y - (-2) = -\frac{4}{3}(x - 0) \]
\[ y + 2 = -\frac{4}{3}x \]
Step 4: Convert to Standard Form
The standard form of a line's equation is \( Ax + By = C \). We need to rearrange the equation:
\[ y + 2 = -\frac{4}{3}x \]
Multiply every term by 3 to clear the fraction:
\[ 3y + 6 = -4x \]
Rearrange to standard form:
\[ 4x + 3y = -6 \]
Final Answer
The equation of the line in standard form is:
\[ 4x + 3y = -6 \]