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.

Google's VC arm Gradient Ventures has joined a $6M investment into Charm, a startup that wants to make the command line more glamorous.

Meanwhile, Gradient, a startup that makes window-mounted heat pumps, is in line for $17.5 million to establish a plant in Michigan that will employ about 300 and have a capacity of 100,000 units a ...