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 ...

Crows can recognize geometric patterns, suggesting that humans aren't unique in understanding shape structure.

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 ...