Learn how to calculate the equation of a line from a graph, work out the gradient from an equation, and visualise intercepts with this step-by step guide.

The straight line through two points will have an equation in the form \(y = mx + c\). We can find the value of \(m\), the gradient of the line, by forming a right-angled triangle using the ...

Open the Excel workbook that contains the chart whose trend-line equation you want to access. Press "Alt-F11" to open Excel's Visual Basic Editor.