II and perpendicular line theroems
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what does it mean if 2 lines are perpendicular to the same line?
the lines are parallel- they are parallel if they are perpendicular to the same line
what does it mean if a line is perpendicular to one of 2 parallel lines?
it must be perpendicular to the other as well- if a line is perpendicular to one of two parallel lines, it is perpendicular to the other
what does it mean if 2 lines are parallel to the same line?
the lines are parallel to each other- if 2 lines are parallel to the same line, they are parallel to each other as well
How to find equation for parallel line
keep slope the same, look for b for slope intercept or points given for point slope form
How to find equation for perpendicular line
negate slope, look for b for slope intercept or use points given for point slope form
How to find equation for perpendicular bisector
• find slope, then flip and negate it (it IS perpendicular) • find midpoint of points (x1 +x2 divided by 2, y1 + y2 divided by 2) for set of points to use, use for either equations
Parallel lines have
equal slopes
Perpendicular lines have
Negative reciprocal slopes