Question

The ordered pairs in the table represent a linear function.

x f(x)
−2 1
−1 ​ 3
0 5
1 7
2 9
What is the value of the function when x = 5?

0

10

15

20

Answer 1

Blackops are you allowed to use a calculator?

Answer 2

yeah

Answer 3

Do you have a texas instrument? (Like A TI-84)

Answer 4

yes

Answer 5

Ok click "stat" then when edit is selected press enter. You should now have a bunch of tables. Is there anything in the tables?

Answer 6

no nothing is happening, it's old and doesn't work right

Answer 7

No nothing is how it is supposed to be :) Use the arrows keys to go to the upper left hand corner and click "2nd" then click 1 and finally enter.

Answer 8

oh well it's not turning on now

Answer 9

do you know any other ways to solve it?

Answer 10

Yes we have a few options. Option A. I help you dowload a calculator application on your computer than you can also use in the future. Option B. I give you the answer. Option C. You attempt to solve using a matrix (I am not 100% sure of how this one works, I usually just use a calculator)

Answer 11

I know a calculator website

Answer 12

it's called mathway

Answer 13

The problem with mathway is that it is more a problem solver (like a cheat) than a calculator. You could download the TI-83 plus at https://sites.google.com/site/ti83interactivecalculator/calculator

Answer 14

oh

Answer 15

i'm really sorry but may I have the answer I have other subjects to work on and I'm trying to hurry

Answer 16

Well shoot I just realised I somewhat messed up. I thought you had a quadratic function but it is only linear.

You can solve that by just creating an equation and then substituting in 5 for the X value, and solving for Y.

Answer 17

oh thank you!

Answer 18

Sorry I wasted your time a bit, did you get an answer?
I know you are low on time so I can just give you it if you need.

Answer 19

no I'm having trouble figuring it out

Answer 20

Ok so your base equation is y=mx + b, have you learned that yet?

Answer 21

yes

Answer 22

So you need to find the m and the b values. the B value is the value when y = 0 (the y intercept) The m value is the slope, which is how much the x changes each time.

Answer 23

ok

Answer 24

I need a little more help

Answer 25

Ok so for the table that you have the headers are a little odd, think about it as being like this
y x
−2 1
−1 ​ 3
0 5
1 7
2 9

So to find the b value you look where y is 0

y x
−2 1
−1 ​ 3
0(here)5 <- X value
1 7
2 9

and look at the x value.

Answer 26

ok

Answer 27

So what is your equation now?

Answer 28

I'm still really confused sorry

Answer 29

Ok so using that data you would be able to make the equation y = 2x + 5. You can use this equation to find the value when x = 5 by substituting 5 in for x, then solving for y.

Just so you know,

I made this equation as follows,
The original equation comes from the slope of the line (y = mx + b)
Then you substitute 2 in for m because the x's change by two numbers every time
Finally you substitute 5 in for b because when y = 0, x = 5

Answer 30

thank you!

Answer 31

No problem, lol :)

Answer 32

The final answer was 15, just so you know!