Study for your quiz tomorrow (Thursday, 12/8) on parallel and perpendicular lines. Complete classwork for homework if you didn't complete it during class. Remember to change equations from standard form to slope intercept form first. Then compare the slopes.
If the slopes of two lines are exactly the same (same number AND same sign), then the lines are parallel.
If the slopes of two lines are opposite reciprocals (flipped fraction AND opposite signs), then the lines are perpendicular.