Question

1. Which two points did you use to draw the line of best fit?
Point #1: 59
Point #2: 71

2. Write the equation of the line passing through those two points using the point-slope formula
y - y1 = m(x - x1). Show all of your work. Remember to find the slope of the line first.
3. What does the slope of the line represent within the context of your graph?
4. Using the equation that you found in question 2, approximately how tall is a person whose arm span is 66 inches?
5. According to your line of best fit, what is the arm span of a 74-inch-tall person?
@agent0smith

Answer 1

I have no idea how to write an equation for a point slope formula..

Answer 2

Post a screenshot

Answer 3

ok

Answer 4

i sucked at this...

Answer 5

was there a table of points, too? screenshot that

Answer 6

umm.... i dont think there was

Answer 7

How'd you make the graph...?

Answer 8

oh - well all the numbers on it already are ones from the points table...

Answer 9

that's what you should screenshot

Answer 10

i dont have them anymore tho xD i got rid of them after i made the graph lol

Answer 11

lol okay then just pick two points on the graph, which is gonna have to be an estimate since you don't have the points

Answer 12

(61, 58) and (68, 65)

Answer 13

oh ok... 61 and 58

Answer 14

but idk how to make that an equation

Answer 15

No those are the two points you picked. Points are coordinates, (x, y)

Answer 16

(61, 58) and (68, 65) so from these two find the slope
\[\large m = \frac{ y_2 - y_1 }{ x_2 - x_1 }\]

Answer 17

then what happens?

Answer 18

plug in the numbers \[\large m = \frac{ 65-58 }{ 68-61}\]

Answer 19

ooooooooooo

Answer 20

i got it - then what? haha

Answer 21

What did you get for m?

Answer 22

m = 13/7

Answer 23

Try again :P

Answer 24

How'd you get 13?

Answer 25

ooo xD hahaha omg idk how that happened 7/7

Answer 26

and that equals 1...

Answer 27

lol good. Now use
\[\large y - y_1 = m(x - x_1)\]and plug in the slope you found, and one of the points, either (61, 58) or (68, 65)