Question

Which equation best describes the line of best fit for the given data?
y = one-halfx
y = negative one-halfx
y = 2x
y = -2x

Answer 1

What is the given data?

Answer 2

@jim_thompson5910 @aum

Answer 3

@zzr0ck3r @zepdrix @satellite73 @mathmate @ganeshie8

Answer 4

Have you printed out the graph and attempted to draw a line of best fit through the scatter plot?

Answer 5

hmm. not really

Answer 6

All the choices are lines through the origin. So the line would be drawn to split the points into two groups.
Examine the slope and there you'll get it.

Answer 7

Alternatively, draw all four lines on the graph and decide which one has the best fit.

Answer 8

You can also draw "mentally"

Answer 9

let me do that really fast and get back with u in a sec, kk? :)

Answer 10

yep!

Answer 11

When slope is negative and the line passes through the origin, it will be in the second and fourth quadrant completely missing the first quadrant.

Answer 12

I know that B and D are out because negative so I think C

Answer 13

Notice the scale on the y-axis vs x-axis. That will give a clue on the slope of the line.

Answer 14

C is correct, with y=2x.
When x=10, y=20 which when joined with the origin passes inside the bunch of points.
This is what I meant by the "mental" plot.
Do take into account of what @aum suggested because that will eliminiate some choices.

Answer 15

okay yay!!!! thxx! so why wouldn't it not be 1/2 instead of 2?

Answer 16

Because when x=10, y=5.
The line joining (0,0) and (10,5) falls way below the given points.

Answer 17

ohhhhh I seee! :)

Answer 18

thxx!!!!

Answer 19

You're welcome! :)