Any line with a gradient of 3 will be parallel to \(y = 3x + 7\). Two examples ... equation for all straight lines, \(y = mx + c\). If \(y = 3x - 1\) the gradient of the graph is 3.

The equation of a straight line on a graph is made up of a \(y\) term, an \(x\) term and a number, and can be written in the form of \(y = mx + c\). For a line with equation \({y}={2}{x}+{ ...