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Student Learning Objectives Name:_______________________________Block:___________ 4.9 Slopes of Parallel and Perpendicular Lines Standard: CC.9-12.G.GPE.5 Prove the slope criteria for parallel lines and use them to solve geometric problems (e.g., find the equation of a line parallel or perpendicular to a given line that passes through a given point). Also CC.9-12.F.IF.7 I can… I can identify and graph parallel and perpendicular lines. I can write equations to describe lines parallel or perpendicular to a given line. Definitions Parallel Lines: Perpendicular Lines: Copy down “Know it! Note” page 293. Parallel Lines Words Graph Copy down “Know it! Note” page 295. Perpendicular Lines Words Graph IN OTHER WORDS…IDENTIFY THE SLOPE If the linear equations have the same SLOPE = PARALLEL LINES If the linear equations have the opposite sign and is the reciprocal = PERPENDICULAR Identify which two lines are parallel. PARALLEL LINES: Identify which two lines are perpendicular. PERPENDICULAR LINES: GET YOUR DUCKS IN A ROW 1. All equations must be in slope-intercept form!!!! Look at their SLOPES (the number with X or X’s Best friend) 3. Three OPTIONS from here Same SLOPES = PARALLEL LINES Opposite sign and it’s the reciprocal = PERPENDICULAR LINES Not the same = NEITHER nothing special just another line :0( 2. WRITING PARALLEL LINES IN SLOPE-INTERCEPT FORM WRITING PERPENDICULAR LINES IN SLOPE-INTERCEPT FORM