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up and to the right...means positive
and up and to the left... means negative
Slope of 1, means y = x
Examples:
draw a line with a slope of:
1 5 2 -1 -3 -6
and then show the "rise over run" for each
Graph y = x
y = 2x
y = 5x
then do
y = -x
y = -3x
y = -5x
compare!
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