Question

Algebra 2 Test Help? Someone please help me ASAP! :(

Answer 1

I'm not trying to cheat! I'm just dumb and completely failing Algebra.. Someone please take the time to help me :/

Which set of ordered pairs in the form of (x, y) does not represent a function of x?
{(–1, 2), (3, –2), (0, 1), (5, 2)}
{(–1, 2), (3, 2), (–2, 2), (0, 2)}
{(–1, 2), (3, –2), (0, 1), (3, 5)}
{(–1, 2), (2, 3), (3, –2), (–2, 0)}

Answer 2

Alright...just remember a function is only a function if it passes the vertical line test. This means for each value 'x' you can only have 1 unique 'y' value, you can never have 2 different 'y' for one x.....say you have something like (1,2) (1,3)

This would look like



If I told you to tell me what value of 'y' is when x = 1 ...would you tel me 2 or 3? you wouldn't know..this is why it is not a function..

So look at all your possible choices...if you see an 'x' that appears more than once in the function...it fails, andin this case is your answer

Answer 3

@johnweldon1993 thank you! can you help me with a few more hard ones?

Answer 4

Sure :)

Answer 5

Which of the following equations best represents the regression line for the data given in the table?
y = x + 2
y = 2x – 2
y = –x – 2
y = x – 2

x|y
1|0
2|-1
4|0
6|4
8|8
10|9
11|8

Answer 6

Okay this one we can play with...see how you have points?

(1 , 0)
(2 , -1)
(4 , 0) etc...

Well you have choices of different equations....so lets try one out...look at equation 1

y = x + 2

Take one of your points...(1 , 0) and plug it in

0 = 1 + 2

Is that correct? of course not...

and just try on like that from there

Answer 7

Now you'll see that none of the equations actually solve this function...makes sense....but which one is the closest to solving it?

Answer 8

is it the second choice?

Answer 9

@johnweldon1993

Answer 10

Ehh...look at option 4 again ....looks alot closer to me

Answer 11

but then if you plug in the first one (0,1) the equation is 0=1-2 and that's false? I'm confused:(

Answer 12

Right...read a couple posts up...the equation wont be solved....it will be close...

Remember your question asks for a line of regression (line of best fit without actually being the solution line)

Answer 13

so what you want to do is find which equation makes the most of the points be true

Answer 14

oh i see.. so it is answer 4?

Answer 15

And here's my next question.. only one more after this and I'm finished :) Which equation defines the graph of y = x² after it is shifted vertically 3 units down and horizontally 5 units left?

y = (x – 5)² – 3
y = (x + 5)² – 3
y = (x – 3)² – 5
y = (x + 3)² – 5

Answer 16

oh no don't disappear now:(

Answer 17

lol no just helping someone else out too :)

Answer 18

Okay to shift a graph up or down...you add or subtract a number from the whole function
to shift a graph left or right...you add or subtract a number from the 'x'

So...we start with x^2

To shift this 3 units down...we subtract 3 from the function....so y = x^2 - 3 make sense?

And to shift the graph to the left 5 units...you ADD 5 to the 'x'

y = (x + 5)^2 - 3

Make sense?

Answer 19

Yep! :) Here's the last one i needed help with...

What is the graph of the absolute value equation?
y = 5|x|

Answer 20

Okay this is the last transformation...a shrink or stretch situation...when you multiply a function by a number greater than 1...it shrinks it horizontally...when you multiply by a number less than 1...you guessed it...it stretches it horizontally...so where are you answer choices?

Answer 21

Well, it was shaped like a v, but I started trying to solve that one and figured it out lol:) I turned it in and gor a 15/15 on my test!:)

Answer 22

So then you're perfect! :) great job!

Answer 23

Thanks for the help!:)

Answer 24

Anytime :)