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# Algebra 1 Chapter 5

## Terms

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What is the same thing as constant of variation?
slope(m=k)
the product of the slopes or two lines is -1
the line is perpandicular
no correlation
points are random on a scatter plot
slope
the steepness of a line upon a coordinate plane
to find the x intercept
substitute 0 for y
m=
slope
line of fit
passes close to most data points on a scatter plot
positive correlation
points seem to be going up on a scatter plot
y intercept
where the line passes through the y axis
standard form
ax+by=c
b=
y-intercept
In direct variation we say...
"y varies directly with/as x"
x intercept
where the line passes through the x axis
vertical line=
undefined slope
to find the y intercept
substitute 0 for x
Rules of standard form
A,B,and C are integers, A is more than 0, and A and B are not both 0
rise
top number in fraction, also vertical change in y
Formula to find slope
y2-y1/x2-x1
run
bottom number in slope fraction, also horizontal change in x
Direct variation equation
y=kx
to find perpindicular lines...
make the slope its opposite reciprocal
y-y1=m(x-x1)
point slope form
parallel lines
lines in the same plane that never intersect
all direct variation graphs pass through...
the origin (0,0)
Perpindicular lines
lines that intersect at right angles
slope-intercept form
y=mx+b
k=
constant of variation
k can not equal
Zero (0)
slope is...
rise over run
negative correlation
points seem to be going down on a scatter plot

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