A linear equation is an equation that consists of terms that are either constants or products of a variable raised to to the power 1 and a constant.

There is a one-to-one relation between each of the variables in a linear equation. For example, y = 2x + 3 is a linear equation. Each of the variables in the equation is raised to the power one. The graph of this equation is a straight line as for each value of x or y there is only one corresponding value of y or x.

On the other hand in the equation y = 3x^2 is not a linear equation as the variable x is raised to power 2. For each value of y, there are two corresponding values of x; this leads to a graph that is a parabola.

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