Any line, except a vertical line has a well defined slope. It cannot be undefined. In much the same way as you cannot be undefined!
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A horizontal line has a slope of zero. The equation of a horizontal line is y = a.
Well since the lines are parallel they would have the same slope. And the slope of any horizontal line is 0. The slope of a vertical line is undefined.
We usually denote the slope of a line as M. Horizontal lines have a slope of zero. Mhorizontal line = 0 Verticle lines have a slope that is undefined. Note that the slope is not infinite, but is undefined. Mvertical line = undefined To write the equation of a horizontal or vertical line, we need to know if it's going to be a slope-intercept form or a point-slope form.
Yes, it is true; slope zero is no slope.
That line is horizontal on the graph. Its slope is zero.