To calculate the gradient of this line using the formula, first pick two coordinates that lie on the line. Any two points can be chosen but for the example below the points (2,7) and (9,3 ...

Any line with a gradient of 3 will be parallel to \(y = 3x + 7\). Two examples are \(y = 3x - 2\) and \(y = 3x + 11.6\). Find the equation of a straight line that is perpendicular to \(y = 2x + 1\).