Question

ONE QUESTION! URGENT!

Answer 1

Some one earlier said it was B.. but im not sure about that

Answer 2

we have to proceed like the prvious exercises, namely we have to determine two coefficients, a and b such that:
y = ax+b, where
y is the money, and x are the hours

Answer 3

ok

Answer 4

using your data I can write this system:
\[\left\{ \begin{gathered}
82.75 = 2a + b \hfill \\
360.75 = 6a + b \hfill \\
\end{gathered} \right.\]

Answer 5

now from the first equation, I write:
b= 82.75- 2a

Answer 6

then I put that value of b into the second equation, and I get:
\[360.75 = 6a + 82.75 - 2a\]

Answer 7

what is the value of a?

Answer 8

one sec

Answer 9

139 / 2

Answer 10

ok! a = 69.5

Answer 11

now we compute b substituting that value of a:
\[b = 82.75 - 2 \times 69.5 = ...?\]

Answer 12

what is the value of b?

Answer 13

82.75

Answer 14

no, it is:
82.75- 2*69.5= 82.75 - 139 = ...?

Answer 15

its impossible t solve that?

Answer 16

why?

Answer 17

ohh nvm sorry i see ... one sec

Answer 18

-56.25

Answer 19

ok! So we have discovered that our function is:
\[y = 69.5{\text{ }}x - 56.25\]

Answer 20

now, in order to get your answer, we have to compute y when x = 8, namely:
\[y = 69.5{\text{ }}x - 56.25 = 69.5 \times 8 - 56.25 = ...?\]

Answer 21

what is the value of y?

Answer 22

499.75 = C

Answer 23

that's right!

Answer 24

Last one!

Answer 25

our line passes at points:
A=2,15)
B=(4,25)
so we ahve to write the equation of the line which passes for those points

Answer 26

oops..have°

Answer 27

here are the steps:
\[\begin{gathered}
\frac{{y - 15}}{{25 - 15}} = \frac{{x - 2}}{2} \hfill \\
\hfill \\
y - 15 = 5x - 10 \hfill \\
y = 5x + 5 \hfill \\
\end{gathered} \]

Answer 28

so what is your option?

Answer 29

C

Answer 30

ok!