A linear line is just a straight line. To graph it, you can use this equation: y=mx+b where m = the slope of the line, and b = the y-intercept of the line, in other words, … where the line crosses the y-axis. 6 people found this useful.he set of all such ordered pairs defines the graph of y = mx + c, called a learning linear graphing.In the equation y = mx + c, the number m is called the slope of the line and c is known as the y-intercept. The y-intercept is the value of y when x = 0.