write an equation from a graph? How do you find the equation of a graph on a calculator? How do you write an equation of a line using a graph? Feed planetcalc.com > ... : Line equation from two points - Online calculator First calculator finds the line equation in slope-intercept form, that is, y=ax+b. It also outputs slope and intercept parameters and displays the line on a graph. www.mathbits.com > Algebral > EquationsLines : Algebra 1 - Using the Graphing Calculator to Write Equations ... Calculator Solution: The Statistics features of the graphing calculator can be used to write the equations of straight lines given points. 1. Enter the points into lists ... www.emathhelp.net > calculators > algebra-1, line-calc.