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Section 1.1 Lines in the Plane
Honors Precalculas
9
Other
11th Grade
09/06/2009
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Term
Slope
 Definition
m= change in y/change in x
or
m=change in x/change in y

m= y2-y1/x2-x1
or
m=x2-x1/y2-y1
Term
Vertical lines
 Definition
Undefined slope
Term
Positive slope (rises from left to right)
 Definition
m>0
Term
Negative slope
 Definition
m<0
Term
Horizontal lines
(What is the slope?)
 Definition
m=0
Term
Slope-interception formula
 Definition
y=mx+b
Term
Point-slope formula
 Definition
y-y1=m(x-x1)
Term
Parallel lines
 Definition
Slopes are equal
Term
Perpendicular lines
 Definition
slopes are the negative reciprocals
m1= -1/m2
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