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Undefined Slope
Vertical
lines have
slopes that are called
undefined. This is because, when you
try to find the slope given any two points
on the line,
you always get a zero
in the
denominator
(for the run):
For more info on slopes and
vertical lines, check out
my lessons on
lines. |
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Union of Sets
The union of two
sets is a set
of ALL the elements of the two sets. (You don't
write the reruns down twice.)
Example:
A = {
1,
2,
3,
a,
b,
c }
B = {
3,
4,
5,
b,
c,
f,
g }
The union is A
U B
= { 1,
2,
3,
4,
5,
a,
b,
c,
f,
g } |
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