An horizontal line . A line parallel with the x-axis.
NB A vertical line / a slope parallel with the y-axis is described as 'undefined'.
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A straight line with a positive slope, passing through the origin.
in a graph, a line with a zero slope is the one that is parallel to the x-axis. It is represented by an equation of the form y = a constant, independent of x values.
"Slope" is the steepness of the line on any graph.
Slope intercept form is y = mx + b, where m is the slope and b is the y intercept. To graph this, look at b. The number there is the y intercept. Look on the y axis on the graph and find the place where that number occurs. Plot that point, which will be (0, b). Then look at the m term. This is the slope. Imagine this number as a fraction. If it is a whole number, imagine it as the whole number divided by one. The fraction is the slope. The numerator is how far you move up or down, and the denomontator is how far you move left and right on the graph. Find the second point this way, then you can draw your line. Hope this helps!
The slope of each point on the line on the graph is the rate of change at that point. If the graph is a straight line, then its slope is constant. If the graph is a curved line, then its slope changes.