For a positive number, as the slope(y=mx+b where m is the slope) gets greater in value, the line gets steeper when plotted on a graph.
For a negative number, as the slope(y=mx+b where m is the slope) gets greater in value, the line gets less steep when plotted on a graph.
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Determine which line is steeper by finding out which has a greater rise over run. I trust you know what rise over run is. You can determine which has a greater rise over run by dividing the rise by the run, and then whichever line has the largest decimal is the steepest.
-- Any number less than -5 is a steeper line sloping down. -- Any number greater than +5 is a steeper line sloping up.
The slope will tell you how much change of Y to X >.
The equation is the definition of the line.If the line is undefined, then it has no equation.
If it is a straight line, then the equation is linear.