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 film demonstrates how to plot ordered pairs on coordinate axes, forming a straight line that represents linear relationships in first-degree equations.

An equation expressing a linear relationship can't consist of more than two variables All of the variables in an equation must be to the first power The equation must graph as a straight line ...

• A linear equation in two variables has infinitely many solutions. • The graph of every linear equation in two variables is a straight line.