x - 7\). If the lines are parallel then \({m_1} = {m_2}\) and if \({m_1} = {m_2}\) then the lines are parallel. The gradient of a line which is parallel to the \(y\)-axis cannot be determined from ...

The equation of the x-axis is \(y = 0\) The equation of the y-axis is \(x = 0\) Any line parallel to the x-axis is horizontal has an equation of the form \(y = a\) Any line parallel to the y-axis ...