You used properties of parallel lines to find angle measures. Now you will find and compare slopes of lines. Here is a tutorial on how slope and line equations work: Slopes and Equations of Lines Now, use the activity to manipulate the line into place from y = mx + b form (slope - intercept form): Graph y = mx + b Activity Important new concept: Two nonvertical lines are parallel if and only if they have the same slope . Also, two lines ...

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