## Abstract

So far we have seen that a straight line can be described as a line with a constant gradient and we know how to find the gradient of any particular line from a graph of the line. In this section we shall look more closely at the co-ordinates of points on a straight line to see if there is a way of finding each *y* from each *x* co-ordinate. If we can establish such a connection then we shall have what is known as the *equation* of the line.

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## Copyright information

© J. Newbury 1981