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A relation is a set of ordered pairs. A functions is a relation that has one _____ for an _____.
One output, or range value for every one input, or domain value.

Is this a function?
{(2,1),(1,0),(6,3),(2,1)}
No because (2,1) and (2,1) have 2 output values for 1 input values.

Use the vertical line test to see if it is a function or not. There will only be 1 point on a vertical line. For example,
..l /
..l/
../
./l = Yes
/ l
\l
.\
.l\ =NO
.l/
./
/l
I understand

Absolute Value functions make a shape of a ____
V

To solve an absolute value question, you need to _______.
Simplify it down to just the absolute value and then write 2 equations.
 l3rl+1>8
 .....1..1
 3r>7
 3r<7

A quadratic equation has an ________ and x as a ____, and forms a _______
A quadratic equation has an exponent and x as a base, and forms a parabula.

To find the function rule, what would you do mathematically to __ to get __?
Yep

If the chart goes in order, like the one below, __________.
x y
1 3__
2 5<l 2
3 7<l 2
4 9<l 2
Multiply by the difference of the numbers on the right. That charrt is 2x+1=y

The direct variation equation is ____
y=kx

The constant of variation, _, is the coefficient of x, and x and y vary directly.
k

The equation for inverse variation is ____.
xy=k

Inverse variations vary inversely, meaning _____
One goes up, the other goes down. It's like a pulley.

The points (3,8) and (2,y) vary inversely. Find the missing value.
 xy=k
 2y=24
 __..__
 2....2
 y=12

