Because it fits the data. That's an extremely vague answer, but it was an extremely vague question.
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A linear equation has no higher powers than 1. This is linear.
A linear equation looks like any other equation. It is made up of two expressions set equal to each other. A linear equation is special because: It has one or two variables. No variable in a linear equation is raised to a power greater than 1 or used as the denominator of a fraction. When you find pairs of values that make the linear equation true and plot those pairs on a coordinate grid, all of the points for any one equation lie on the same line. Linear equations graph as straight lines.
Yes it can. A linear equation in the form of y=mx+b can always be graphed used the x and y intercepts.
When it is a linear equation.
It is a linear equation.