# Algebra Graphs and Functions

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1. 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.
2. 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.
3. 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
4. Absolute Value functions make a shape of a ____
V
5. 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
6. 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.
7. To find the function rule, what would you do mathematically to __ to get __?
Yep
8. 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
9. The direct variation equation is ____
y=kx
10. The constant of variation, _, is the co-efficient of x, and x and y vary directly.
k
11. The equation for inverse variation is ____.
xy=k
12. Inverse variations vary inversely, meaning _____
One goes up, the other goes down. It's like a pulley.
13. The points (3,8) and (2,y) vary inversely. Find the missing value.
• xy=k
• 3x8=k
• 24=k

• xy=k
• 2y=24
• __..__
• 2....2
• y=12
 Author: MoonRacer ID: 56414 Card Set: Algebra Graphs and Functions Updated: 2011-05-17 20:21:40 Tags: Review Graphs Functions Algebra MoonRacer Folders: Description: Review of Graphs and Functions in Algebra Show Answers: