It is the rise/run for the line.
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A smooth line drawn between points on a graph to reflect the general trend.
It is the description of a slope of a line which connects from many points you mark to show a way that your graph data may increase or decrease. If it is decreasing, you have a downwards trend. If it is increasing, you have an upwards trend.
To determine the trend of linear function graph or equation you would simply look at the slope of the line. This is represented by the m in the equation, f(x) = mx + b.
The line perpendicular to a line with a slope of 1/5 has a slope of -5.
trend line