This question is fairly ambiguous, but...
If your plotting two dimensionally in Cartesian (x and y) coordinates.
Then, a straight line is given by: y = m*x + b
where (m is the slope of the line (rise/run), and b is the y-intercept (where the line crosses the y-axis).
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Graphing or plotting.
A Texas Instruments graphing calculator can be used as a basic calculator, a scientific calculator and a graphing calculator.
In systems of equations, the graphing method is solving x and y by graphing out the two equations. x and y being the coordinates of the two line's intersection.
A graphing calculator is a scientific calculator with a graphing display window. Otherwise, there are no limits to the type of calculations that can be made on either of them.
A graphing calculator is used to plot graphs and solve equations. Most graphing calculators are programmable so one can create customized programs.