###
horizontal lines slope =

zero

###
vertical lines slope =

undefined

###
parallel lines slopes

are equal

###
perpendicular lines slopes

are reciprocals of each other

###
addition/subtraction with matrices

the dimensions have to be the same

###
multiplying matrices

the number of columns on the first matrix has to be equal to the number of rows of the other matrix

###
identity matrix

a square matrix (same number of rows and columns) with 1's along along it's main diagonal & 0's elsewhere

###
inverse matrix

two matrices that have a product of an identity matrix

###
amplitude

1st step in graphing cos/sin graphs - indicates the vertical stretch

###
period

2nd step in graphing cos/sin graphs - 360 / b - indicates how many waves you will see in 360 degrees

###
phase shift

3rd step in graphing cos/sin graphs - -c / b

###
vertical shift

4th step in graphing cos/sin graphs - d

###
sinx

0 - max - 0 - min- 0

###
cosx

max - 0 - min - 0 - max

###
d value added to sinx/ cosx

the y values on the graph

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