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Algebra 1 Chapter 5

Slopes of lines
STUDY
PLAY
Perpendicular lines
lines with opposite reciprocal slopes of each other
ex. y=2x+2
y=-1/2x+3
parallel lines
lines with the same slope
ex. y=3x+3
y=3x-11
vertical lines
lines that are straight up and down, undefined slope, x=...
ex. x=5
horizontal lines
lines that are straight side to side, slope of 0, y=...
ex. y=-3
scatter plot
a graph of non-linear data points
best fit line
the line that most clearly approximates the data in a scatter plot
slope intercept form
y=mx+b
m= slope
b=y-intercept
Point slope form
y-y1 = m(x-x1), where m is the slope and (x1,y1) is the point the line is passing through.
standard form
Ax + By=C, where A, B, and C are not decimals or fractions, where A and B are not both zero, and where A is not a negative.