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 ...
The F-shape can be backwards, sideways or upside down. These images all show alternate angles. The angles on opposite sides of the transversal within the parallel lines are always equal.
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