A linear equation is drawn as a straight line on a set of axes ... represent the relationship given in the equation. For example, for y = 3x, the y value is always equal to '3 lots' of the ...

Let's look at an example question. A straight line passes through the points (1, 5) and (3, –1). Find the equation of this line. First, draw a sketch to help make sure your answers are sensible.