Graph a line that is parallel to the given line. Determine the slope of the given line and the one you graphed in simplest form.
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Understand the Problem
The question is asking to graph a line that is parallel to a given line and to determine the slope of both the given line and the newly graphed line in its simplest form.
Answer
The slope of the lines is $m = -\frac{5}{3}$.
Answer for screen readers
The slope of both the given line and the newly graphed line is ( m = -\frac{5}{3} ).
Steps to Solve
- Identify the slope of the given line
First, we need to determine the slope of the given line. The slope ( m ) can often be identified from the graph. If the line moves downwards from left to right, the slope is negative.
- Finding the slope
To get the slope from two points on the line, use the formula:
$$ m = \frac{y_2 - y_1}{x_2 - x_1} $$
Choose two clear points from the graph (e.g., ((-1, 3)) and ((2, -2))). The slope calculation will be:
$$ m = \frac{-2 - 3}{2 - (-1)} = \frac{-5}{3} $$
- Determine the slope of the parallel line
Since parallel lines have the same slope, the slope of the new line will also be ( m = -\frac{5}{3} ).
- Graph the new line
Using the slope ( m = -\frac{5}{3} ), you can graph the parallel line. Start from any point you choose, e.g., (0, b) where ( b ) is the y-intercept of your chosen point.
- Plotting the line
From your chosen point, move 3 units right (positive x-direction) and 5 units down (negative y-direction), or 3 units left and 5 units up, to find another point on your parallel line.
The slope of both the given line and the newly graphed line is ( m = -\frac{5}{3} ).
More Information
In a coordinate plane, lines that are parallel will always share the same slope, regardless of their y-intercepts. This means you can freely translate the line vertically to find a parallel line without changing the slope.
Tips
- Incorrectly calculating the slope: Make sure you use the correct points and subtract in the right order to find the slope accurately.
- Confusing parallel and perpendicular lines: Remember, parallel lines have the same slope, while perpendicular lines have slopes that are negative reciprocals.
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