Question

HELP

Answer 1

hint: find the equation of the line through (1,125) and (2,200)

Answer 2

how do I do that?

Answer 3

you start by finding the slope

Answer 4

using the slope formula

\[\Large m = \frac{y_{2}-y_{1}}{x_{2}-x_{1}}\]

Answer 5

?

Answer 6

what are the y coords of the points I gave you

Answer 7

(1,125) and (2,200)

Answer 8

what are the y coords of those points

Answer 9

I don't know

Answer 10

each point is of the form (x,y)

Answer 11

the second coord is the y coord

Answer 12

so the y coordinates are what?

Answer 13

idk how you're getting that

Answer 14

(1,125) and (2,200) are the given points

the second number in each pair is the y coordinate

Answer 15

right now I just want you to list the y coordinates

Answer 16

so (2,5) (0,0)

Answer 17

no

Answer 18

the point (1,125) has the x coordinate of 1 and a y coordinate of 125

Answer 19

the point (2,200) has the y coordinate of ???

Answer 20

2?

Answer 21

that's the x coordinate

Answer 22

I want the y coordinate

Answer 23

x coordinate of 2 y coordinate 200

Answer 24

correct

Answer 25

so we have these y coordinates: 125 and 200

Answer 26

from (1,125) and (2,200)

Answer 27

subtract the y coordinates to get ???

Answer 28

75

Answer 29

yes if you do 200 - 125 = 75

Answer 30

now you subtract the x coords in the same order

2 - 1 = 1

Answer 31

y difference: 75

x difference: 1

divide the two values: 75/1 = 75

the slope is m = 75

Answer 32

make sense?

Answer 33

yes!

Answer 34

we know that m = 75 is the slope

we also know (x,y) = (1,125) is one point on the line

so...


y = mx+b

y = 75x+b ... plug in m = 75

125 = 75(1)+b ... plug in (x,y) = (1,125)

125 = 75 + b

b = ???

Answer 35

50

Answer 36

m = 75 and b = 50

Answer 37

y = mx+b

y = 75x+b ... plug in m = 75

y = 75x + 50 ... plug in b = 50

Answer 38

the equation that goes through the majority of the points on that scatter plot is y = 75x + 50

Answer 39

so you can use y = 75x + 50 to answer the question

Answer 40

ok next?

Answer 41

they want to know the value of x when y = 732

y = 75x + 50

732 = 75x + 50

solve for x

Answer 42

I get x=682/75

Answer 43

what is that in decimal form?

Answer 44

909

Answer 45

the decimal point is missing somewhere

Answer 46

close

Answer 47

I'm getting something slightly different though

Answer 48

double check your decimal number

Answer 49

9.09

Answer 50

yes

Answer 51

9.09 thousand = 9.09*1000 = 9,090