Question

1. which set of ordered pairs in the form of (x,y) does not represent function of x?
-(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)
3.what is f(-5) if f(x)=2x-1+10
-21
-19
--1
--21
5.what is an equation of the line slope-intercept form?
-y=4x+3
-y=-3x+4
-y=4x+3
-y=3x+4

Answer 1

wait... where's question 2?

Answer 2

its not on there cause it was a picture question and i didnt wanna get confused on the questions.

Answer 3

ok, well for Q1: definition of "a function" is there is no more than one y-value output for any given x-value input
so look through your pairs
find one that has the same x value twice
check if it has a different y value
if it does, Boom, not a function!

Answer 4

eg: pairs of line one:
-(0,2), (1,-1),(2,3),(3,-2)
x values are 0, 1, 2 and 3
x values not repeated
so assume its a function

Answer 5

following ok? @miss.roy ?

Answer 6

yeah

Answer 7

cool, so which isn't a function?

Answer 8

the 2ed one?

Answer 9

ehter that one or the 3ed one.

Answer 10

...ok, why?

Answer 11

what are the x values of the 2nd line?

Answer 12

g2g, hill sprints, can u finish this off @Yttrium ?

Answer 13

Let's see.

Answer 14

So what do you think is the answer here?

Answer 15

i think its b

Answer 16

Whoops. Why?

Answer 17

The value of x there didn't repeat. So automatically that is not the answer.

Answer 18

okay so i just did it C?

Answer 19

Still it didn't repeat. See x = 0, -1, 2, 3

Answer 20

okay so D because they have all the same y value

Answer 21

Yeah. And value of x repeat at 1. It's a many-to-many function, which is not plausible.

Answer 22

okay so D?

Answer 23

Yes.

Answer 24

alright what about 2?

Answer 25

It's easy. Just plug in -5 for every x in f(x)

Answer 26

so f(-5)=2(-5)-1+10

Answer 27

Yes.

Answer 28

okay so after that do what

Answer 29

Evaluate. So that you will arrive at an answer.

Answer 30

okay so im confused

Answer 31

what do you subtract?

Answer 32

2(-5)-1+10
Apply PEMDAS.
Parenthesis Exponents Multiplication/Division Addition/Subtraction

Answer 33

We have parenthesis, right? So we will evaluate it 1st.
-10-1+10
-11+10
???

Answer 34

You get it now?

Answer 35

kinda

Answer 36

Just tell me where you get confused.