SOLUTION: How can you determine if two lines are perpendicular?

Question 133953: How can you determine if two lines are perpendicular?
Found 2 solutions by jojo14344, solver91311:
Answer by jojo14344(1513) (Show Source): You can put this solution on YOUR website!
If two lines meet and form 90 degree angle, then they are perpendicular.
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
If you are given the equations of the lines, solve the equations for y in terms of x -- in other words put them into slope-intercept form, . Then compare the slopes of the two lines. Two lines are perpendicular if and only if their slopes are negative reciprocals of each other. That is to say if is the slope of one of the lines and is the slope of the other line, the lines are perpendicular if and only if .
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