Relation

any set of ordered pairs:

{(1,2), (2,3), (4,5)}

• where y changes opposite of x
• xy=k or y = k/x

all the names for "X"

domain

independent variable

• where y changes directly with x
• y = kx

The 2nd number in an ordered pair

(x, y)

(8, 2)

f(5d) = 2(5d) + 5

= 10d + 5

f(5d) = 10d + 5

its where an ordered pair can be plugged into an equation and it makes a true statement:

(2,2) --> y = 3x - 4

            (2) = 3(2)-4

             2 = 6 - 4

             2 = 2 --> (2,2) is a solution :)

If a vertical line is placed anywhere on the graph and only crosses once, then the graph represents a function.

[image]

1. range
2. dependent variable
3. f(x)

it is the first number in an ordered pair:

(x, y)

(8,2)

Equations that are functions are written in _______

With direct variation, when x = 0, y = ____

0

As x increases in value, y decreases in value in an ________ variation.