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Without graphing, determine which of the following equations represents lines that are parallel to each other. Which are perpendicular? Show how you know. Homework Help ✎

Put each equation into slope-intercept form
(, where is the slope and is the -intercept). That means to solve for .

Compare the slopes.
If they are equal then they are parallel.
If they are the negative reciprocal of each other then they are perpendicular.