Question

ONE QUESTION!

Answer 1

here we have a similar problem, namely we have to determine the coefficient a and b of the subsequent relationship (linear):
y=ax+b

Answer 2

c

Answer 3

c

Answer 4

each time add 4.80 to the number before

Answer 5

in order to that I will use the data of your problem:
\[\left\{ \begin{gathered}
204.80 = 4a + b \hfill \\
209.60 = 8a + b \hfill \\
\end{gathered} \right.\]

Answer 6

from the first equation I get:\[b = 204.8 - 4a\]

Answer 7

yeah thats what i got the 204.8

Answer 8

then I substitute it into the second equation:
\[209.6 = 8a + 204.8 - 4a\]

Answer 9

and i solve that foe a correct?

Answer 10

yes!

Answer 11

it's all ok now!

Answer 12

1.2

Answer 13

Great!

Answer 14

wait please, I'm going to check your result

Answer 15

that's right!

Answer 16

now, we have to compute the value of b

Answer 17

and we get $214... something i know

Answer 18

in order to that, I substitute a=1.2 into the expression for b, namely:
\[b = 204.8 - 4a = 204.8 - 4 \times 1.2 = ...?\]

Answer 19

I think b=200

Answer 20

204.8 - 4.8 = 200

Answer 21

ok one sec

Answer 22

but thats been solved and i cant solve that its already done

Answer 23

It is the first time that I solve this problem

Answer 24

hmm ok one sec so b=200 then what do we do? somehow pug it in

Answer 25

our function is:
y= 1.2x+200

Answer 26

now we have to set x=12, and compute the correspondent value og y, namely:
y= 1.2*12+200=...?

Answer 27

ok

Answer 28

y=214.4

Answer 29

congrats! you got the right answer

Answer 30

so what is the right option?

Answer 31

C

Answer 32

yes! :)