In general, it is linear if it is of the form a1x1 + a2x2 + ... + anxn + a0 = 0
where a1, a2, ... an and a0 are constants, and x1, x2, ... , xn are variable.
If there are only two variables then usually x1 = x and x2 = y.
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When the equation represents a horizontal line.
There is one form of linear equation that is not a function, and that is when x = c, where c is a constant.
A linear function is a function, or equation, that when graphed, will form a straight line.
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.
how do we find linear feet or inche