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Most linear equations are functions (that is, for every value of x, there is only one corresponding value of y). When you assign a value to the independent variable, x, you can compute the value of the dependent variable, y. You can then plot the points named by each (x,y) pair on a coordinate grid.
Linear Equations. 1  A simple linear equation is of the form: y = mx + c. 2  A linear equation looks like a straight line when graphed. 3  It has a constant slope value. 4  The degree of a linear equation is always 1. 5  Superposition principle is applicable to a system characterized by a linear equation.