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.
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A graph need not have a trend: it is no big deal.
A trend on a graph shows the rising and falling of a subject's popularity. For example, a graph can show a trend in the type of clothing that are being sold or food.
A line graph shows a trend over time.
trend line
A trend is how high or low the graph shows