Question

Help PLz
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. (3 points)
Part B: Compare the data in the table with the relation f(x) = 2x + 13. Which relation has a greater value when x = 7? (2 points)
Part C: Using the relation in Part B, what is the value of x if f(x) = 75? (5 points)

Answer 1

A) it represents a function
all the first co- ordinates( x values) are different

Answer 2

@dayakar can u help with b this is what i have >
fx=2x+13
7=2(7)+13
7=17
is this correct or not ?

Answer 3

or do i imput the other numbers till i get 7 ?

Answer 4

@ShelbyWyatt can u help plz?

Answer 5

lets see

Answer 6

y = 2x + 13 gives 27 when x = 7
and the first function gives 8 when x = 7

Answer 7

i dont think i learned this yet

Answer 8

- so 2x + 13 gives the greater value.

Answer 9

for Part C you need to solve the equation

75 = 2x + 13 ( f(x) is given as = 75)

Answer 10

i get it now

Answer 11

x=31 ?

Answer 12

Correct :-)

Answer 13

and thank you for all your help :D

Answer 14

Thanks for trying to learn.

Answer 15

yes its refreshing to see someone trying to learn rather than just wanting the answer.