The slope of the red line is -1
What are parallel lines?
"These are the lines in the same plane that are at equal distance from each other and never meet."
What is slope of a line?
"It is the change in y coordinate with respect to the change in x coordinate."
For given question,
The red line and the green line shown in the figure are parallel lines.
The slope of the green line is -1.
We know that the slope of the parallel lines is equal.
This means the slope of red line would be -1
Therefore, the slope of the red line is -1
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