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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.
Equations. Linear equations are in the form y = mx + b, whereas quadratic equations have a variable that is squared, so they are in the form y = ax^2 + bx + c. Graphs. The graph of a linear equation on an x-y coordinate plane is a straight line. A quadratic equation results in a graph shaped like a parabola. Slope