Two nonvertical lines have slopes m₁ and m₂, respectively.
The lines are parallel if _____
and the_______ are unequal; the line are perpendicular if______

Question

Two nonvertical lines have slopes m₁ and m₂, respectively.  The lines are parallel if _____  and the_______ are unequal; the line are perpendicular if______

Doris · Answer

The lines are parallel if  m₁ = m₂  and the  y-intercepts  are unequal; the lines are perpendicular if  (  m₁  )  (  m₂  )     =     -  1 .

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