Help with math pls? I will fan and medal

Question

isuckatschool43 · Answer

attachment

cderaalien · Answer

The last one is NOT a function

isuckatschool43 · Answer

okay

anonymous · Answer

A and B are for sure

isuckatschool43 · Answer

how?

anonymous · Answer

Look at the X.  If the X repeats then it is only a relation.  If you can do either the vertical line tst or see that the outputs arent repeating in the X then they are functions

anonymous · Answer

Im not sure about C tho because its not a quadratic.  graph it for me

anonymous · Answer

Do you have a graphing calculator?

isuckatschool43 · Answer

https://www.desmos.com/calculator/xkzrsydixq

anonymous · Answer

Ok, so it is  a function because a vertical line only would pass through one point.  So AB and C are all functions to my understanding

anonymous · Answer

A isn't a function because it maps one x value to two y-values. B and C are, but I'm not sure on D.

isuckatschool43 · Answer

it graphs 3 y values https://www.desmos.com/calculator/sxexqbsgq5

anonymous · Answer

A is not a function because the -1 repeats, good catch @Alphabet_Sam lol

isuckatschool43 · Answer

okay can you help with some more please?

anonymous · Answer

yea, see how if you drew a vertical line on -1 it would pass through two points instead of one? That was what I meant by Vertical Line test.  And yea hold on

anonymous · Answer

Do you know how to graph the two lines?

isuckatschool43 · Answer

k

anonymous · Answer

Do you know how to graph those two lines?

isuckatschool43 · Answer

just enter them into the graphing calc?

anonymous · Answer

you can plot the two points and then connect them with a straight edge (or a straight line on the pc) for both lines

anonymous · Answer

What kind of math is this anyway? Liike what is the name of the course?

isuckatschool43 · Answer

it just says functions

isuckatschool43 · Answer

so like this? https://www.desmos.com/calculator/2omlsi7mbv

anonymous · Answer

Ok, are you able to connect the points of (-1,7) and (5,13)?

anonymous · Answer

Like can u connect them with a line?

isuckatschool43 · Answer

yes

anonymous · Answer

ok, do that for both sets of points

isuckatschool43 · Answer

it wont let me

isuckatschool43 · Answer

@Da_Homie it wont let me make lines for some reason

anonymous · Answer

Ok, do you have graph paper where you are now??

isuckatschool43 · Answer

no i dont have any at this house

isuckatschool43 · Answer

sorry

anonymous · Answer

Its ok.  We will have to imagine lines then.  So if we "drew" a line connecting the red dot and the blue dot, and the green and purple dots you can kind of see where they intersect at, you know what I mean?

isuckatschool43 · Answer

yeah one second i found a way

isuckatschool43 · Answer

does this work?

anonymous · Answer

yes, perfect!  So now that you have graphed the line, all you have to do is find the coordinates of the point that intersects them, you see?

isuckatschool43 · Answer

yes

isuckatschool43 · Answer

like (1,9) maybe?

isuckatschool43 · Answer

its hard to tell

isuckatschool43 · Answer

@Da_Homie

isuckatschool43 · Answer

where did you go

isuckatschool43 · Answer

@Da_Homie hello?

anonymous · Answer

Sorry, Im back, I had to do something.  So you take your best guess and then check to see what the answers are.  So the closest thing to (1,9) is (1,7) so that is probably your answer.

isuckatschool43 · Answer

my internet is being weird sorry

anonymous · Answer

I have to go for now.  I will be back later

isuckatschool43 · Answer

okay