Undefined slope.
That line is horizontal on the graph. Its slope is zero.
X=5 is a vertical line, so it has no slope. When I say it has no slope, I don't mean the slope is 0, I mean the slope is nonexistent.
Slope: -9
That line is horizontal on the graph. Its slope is zero.
The slope is -0.2
The slope is 5.
When the equation of a line is written in standard form: y = mx + c, the slope of the line is m. Here, y = 3x + 5 so slope = 3
5
7
11
The slope is 5. Parallel lines always have the same slope.
-1/5