1. Parallel Lines: SLOPES ARE THE SAME!!
Use slope-intercept form to determine whether the lines are parallel. 1.
Write equations of parallel lines.
2. Write an equation of a line that contains ( 5 , 1 ) and is parallel to
Have the same slopes and different y-intercepts.
SLOPES ARE THE SAME!!

2. Perpendicular Lines: OPPOSITE RECIPROCALS! Intersect at 90º angles.
3. Write an equation of a line that contains ( 0 , -2 ) and is perpendicular to y = 5x + 3.
Tell whether the lines are parallel, perpendicular, or neither.
Intersect at 90º angles.
Their SLOPES ARE
OPPOSITE RECIPROCALS!