A linear function is a function whose graph is a straight line.
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No, y=8 is a fixed value. A linear equation would look something like y=x+8 - That would produce a straight line graph if the values of x & y were plotted against each other on a graph.
A linear equation looks like a straight line, it sometimes does slope, but it is straight.
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.
Any shape other than a straight line!
You have to solve it or if the answer is provided to you look at the y axis which is the one on the right of the graph. If the numbers form a pattern then its linear if there not... Well you can figure that out. It works for me most of the time and on a test one of five was wrong on this method.