Two lines have equations \(y = {m_1}x + 3\) and \(y = {m_2}x - 7\). If the lines are parallel then \({m_1} = {m_2}\) and if \({m_1} = {m_2}\) then the lines are ...

Parallel lines are straight lines which have the same direction and so never ... The lines make an F shape. Notice that the F shape can be upside down or back to front. We've already seen that ...