how can you tell if two lines are parallel, without graphing them, if you're given equations of the lines.

how can you tell if two lines are perpendicular, without graphing them, if you're given equations of the lines.

Question

how can you tell if two lines are parallel, without graphing them,  if you're given equations of the lines. 

 how can you tell if two lines are perpendicular, without graphing them,  if you're given equations of the lines.

bibby · Answer

Parallel lines have the same slope, perpendicular lines have negative reciprocal slopes of each other

anonymous · Answer

Could someone show me how to find  the points (3,7) and (5,8).

bibby · Answer

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theyre somewhere around there

bibby · Answer

draw a graph, and count. then plot according to the respective axes.

anonymous · Answer

can i write numbers on the graph?

bibby · Answer

sure, it's easier to use an online grapher though

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anonymous · Answer

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