A linear equation.
It may be written in the form y = mx + c or, more generally, ax + by + c = 0
The first form is useful in two dimensions but the second is more useful for extension from 2 to 3 or more dimensions.
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y=mx+c
It is the locus of all points whose coordinates satisfy the equation of the line.
A linear function is a function whose graph is a straight line.
The graph will be a line.
When it is a linear equation.