Parallel lines have the same slope, to find the parallel line at a given point you should simply calculate the Read More Save to Notebook! Sign in Send us Feedback Free y=mx+b calculator - find the slope intercept form of a line given two points, a function or the intercept step-by-step. BYJU’S online parallel line calculator tool makes the calculation faster, and it displays the equation in a fraction of seconds. How to Use the Parallel Line Calculator? The procedure to use the parallel line calculator is as follows: Step 1: Enter the coefficient of the line equation and a point in the input field.