however there are times where you may be required to calculate the gradient using the relevant formulae or your knowledge of parallel and perpendicular lines. Find the equation of the line ...

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 \(y = 2x + 1\).