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.
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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