How to Estimate the Y Intercept in Excel. When you graph a series of (x,y) coordinates in Microsoft Excel 2010, you can use the program's built-in functions to display the equation for the line ...

Revise how to plot a linear equation graph. Learn how to read x and y coordinates from a graph in this BBC Bitesize maths KS3 guide.

Any equation that can be rearranged into the form y = m x + c, will have a straight line graph. m is the gradient, or steepness of the graph, and c is the y - intercept, or where the line crosses ...