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Algebra 18 Online
OpenStudy (anonymous):

can someone please help me in algebra 2?

OpenStudy (jango_in_dtown):

question?

OpenStudy (anonymous):

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

OpenStudy (wwb00):

Let's work together on this. Ok?

OpenStudy (anonymous):

ok thanks

OpenStudy (wwb00):

The definition of a function is a special relationship where each input has a single output.

OpenStudy (anonymous):

wouldnt it be B then?

OpenStudy (wwb00):

Anything that has the same x but with different y can not be a function.

OpenStudy (wwb00):

D has 1 corresponding to both 2 and -2. Each x can only have one output.

OpenStudy (wwb00):

For B there is no x value that has a different y value, so it can't be B

OpenStudy (wwb00):

A{(0, 2), (1, –1), (2, 3), (3, –2)} B{(0, –2), (1, 1), (2, 3), (3, –2)} C{(0, 2), (–1, –1), (2, –3), (3, 2)} D{(0, 2), (1, 2), (1, –2), (3, 2)} Is this the letters?

OpenStudy (anonymous):

yes

OpenStudy (wwb00):

Ok. We know that B can not be the answer. In A, all of the x has unique y values, which is a function, so it can't be A, C also has unique y values for x. D is the only question that has an x value with two different y values.

OpenStudy (wwb00):

Remember that y is dependent of x

OpenStudy (wwb00):

So what do you think the answer must be?

OpenStudy (anonymous):

it has to be D then. it makes sense. thanks. i appreciate it

OpenStudy (wwb00):

No problem. I'm glad it makes sense to you! :)

OpenStudy (anonymous):

is there any way u can help me with another one?

OpenStudy (wwb00):

I have to go in a minute, I may be able to answer your question quickly

OpenStudy (anonymous):

3. What is f(–3) if f(x) = |2x – 1| – 5? (1 point) 2 –12 0 –10

OpenStudy (wwb00):

Substitute the -3 for x in the function.

OpenStudy (wwb00):

|2(-3)-1|-5

OpenStudy (anonymous):

B?

OpenStudy (wwb00):

which becomes 7-5

OpenStudy (wwb00):

GTG

OpenStudy (wwb00):

sorry

OpenStudy (anonymous):

woah..... i got -12

OpenStudy (anonymous):

2*-3 is -6-1 -5

OpenStudy (anonymous):

ok. thanks

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