Question

2. Which set of ordered pairs and equation for a best-fit line represents data from the table?


(x1, y1) = (64, 135), (x2, y2) = (74, 166)
y = 3.14x – 66.42
(x1, y1) = (62, 131), (x2, y2) = (70, 152)
y = 2.625x – 31.75
(x1, y1) = (62, 131), (x2, y2) = (72, 158.5)
y = 2.75x – 12
(x1, y1) = (64, 130), (x2, y2) = (72, 167)
y = 3.5625x – 98

Answer 1

@phi

Answer 2

do you know the 2 point form representation of a straight line.

Answer 3

@mathstudent55

Answer 4

Are you told which method to use?

Answer 5

no

Answer 6

that is all the info

Answer 7

You must have a textbook, or some other source of math info. What methods have been shown to you?

Answer 8

I left it at school I was staying for a club and left it in my locker

Answer 9

so i dont remember

Answer 10

all I know is it is pre calc

Answer 11

and right now I am in a panic

Answer 12

One method is to plot all the points. Then you find which line best averages the points. Then you pick two points on the line and find its slope. Then you use a point on the line and the slope to find the equation of the line.

Answer 13

Another method is to use a calculator that can do linear regression for you.

Answer 14

There is also a way of doing all the work manually and figuring it out manually without plotting.

Answer 15

Ok I will plot the points and see how it goes

Answer 16

Also, notice that for each age, you need to plot the age vs the average cholesterol count, so first, you need to find all the average cholesterol counts for all ages.

Answer 17

I just got an A on the practice thx for the help

Answer 18

62, 131
63,133
64, 135
65, 137.5
66, 140
67, 143
68, 146
etc.

Answer 19

Ok, great!

Answer 20

thx so much

Answer 21

You're welcome.