Question

ONE QUESTION!

Answer 1

we have y = temperature, and x = time
we have to conjecture thi relationship:
y=ax+b

Answer 2

now I use the numerical data of the problem, so I can write:
\[\left\{ \begin{gathered}
66 = 5a + b \\
87 = 12 + b \\
\end{gathered} \right.\]

Answer 3

we have to solve that system

Answer 4

ok

Answer 5

ok well thats a fraction

Answer 6

try to solve the first equation for b, please

Answer 7

a= -b/5 + 66/5

Answer 8

ok! Now substitute that value for a into the second equation

Answer 9

ok

Answer 10

\[\left\{ \begin{gathered}
66 = 5a + b \\
87 = 12a + b \\
\end{gathered} \right.\]

Answer 11

b=75

Answer 12

a = -b/5 + 66/5

Answer 13

please wait I'm checking your value of b

Answer 14

ok

Answer 15

I got b= 51

Answer 16

well i wasn't right then

Answer 17

no problem.
Now we substitute b=51 into the first equation, and we get: a=3

Answer 18

please wait a moment

Answer 19

ok

Answer 20

@epoweritheta

Answer 21

@Sparklestaraa

Answer 22

@welshfella

Answer 23

@phi

Answer 24

I think its A

Answer 25

a snapshot of the screen as a png file is way faster to look at than the .doc file.

Answer 26

your choices are equations of a line
First step:
look at the data, and make (x,y) pairs
for example (5,66) (at 5 it's 66)
and (12, 87) (at noon, 12 o'clock, it's 87)

now you have two points
now do the usual thing:
find slope = change in y divided by change in x

then find the y-intercept.

Answer 27

in other words, this problem is finding the equation of a line, starting with 2 points.
Do you know how to do that, or do you need help?

Answer 28

hmm OK one sec........ i got 51 with Michele help and thats the y intercept, correct?

Answer 29

I would first find the slope
(87-66)/ (12-5)

Answer 30

ok then thats 3

Answer 31

so its A cause 3 is 3x

Answer 32

so you start with
y= mx +b
m is 3
y = 3x + b
now use (5,66) to find b:
66 = 3*5 + b
66= 15+ b

Answer 33

i see why we find slope first

Answer 34

The idea was notice we could list two points, then we can use our knowledge of how to find the equation of a line through 2 points.