Question

help please
The table shows the outputs y for different inputs x:


Input
(x) 5 6 7 8
Output
(y) 2 5 8 11


Part A: Do the data in this table represent a function? Justify your answer.
Part B: Compare the data in the table with the relation f(x) = 2x + 13. Which relation has a greater value when x = 7?
Part C: Using the relation in Part B, what is the value of x if f(x) = 75?

Answer 1

if each x, maps to only one y value, it can be a function

Answer 2

eg

Input
(x) 1 1 2 3
Output
(y) 2 5 8 11

is not a function, because

x = 1, gives two y values: 2 and 5

Answer 3

@Mr.kole does your table, have and x input, giving multiple y values?

Answer 4

yh

Answer 5

pardon?

Answer 6

does any x input,
give multiple y values?

Answer 7

no

Answer 8

so can it be a function ?

Answer 9

yh

Answer 10

yes.

Answer 11

now B

What is the value in the table, that relates to x = 7

Answer 12

hey i not reall good with algebra so please have mercy

Answer 13

really

Answer 14

nope,

what is y, when x is 7 use the table

Answer 15

8

Answer 16

x=7
Input |
(x) 5 6 7 8
Output |
(y) 2 5 8 11
|
y=8


yes!

Answer 17

now
what is
f(x) = 2x + 13.

when x = 7

ie f(7) = 2(7) + 13.
=
=

Answer 18

2 times 7 plus 13 equals ?

Answer 19

noooo

Answer 20

f(7) = 2(7) + 13.
= 14 +13
=

Answer 21

27

Answer 22

So Which relation has a greater value when x = 7?

Answer 23

y

Answer 24

when x= 7:

y = 8 and f = 27

which is greater

Answer 25

f

Answer 26

it's f

Answer 27

right?

Answer 28

now for C

Answer 29

it asks, for which x, is f(x) = 2x + 13 = 75

Answer 30

so solve

2x+13 = 75


for x

Answer 31

yh

Answer 32

31

Answer 33

done!

Answer 34

thanks