Mathematically similar to a linear relationship is the concept of a linear function. In one variable ... expressed on the top right quadrant of a graph with an X and Y-axis.

Linear equations can be shown on a graph. Find out how to create one in this Bitesize KS3 maths video. A quadratic function can be drawn as a parabola on a graph. Find out how to plot the graph in ...

You just have to put the price on y-axis (up and down) and the quantity sold on the x-axis (left to right) and then draw through both points on the graph, and you have a linear demand curve.