Question

I WILL FAN AND MEDAL!! I need help with lines of best fit! please help!

Answer 1

.f(x) = 45x
B.f(x) = x
C.f(x) = 2x
D.f(x) = 45x + 45

Answer 2

They want the equation of the straight line they plotted.
I would first find its slope change in y divided by change in x
can you do that ?

Answer 3

can you find two points that the line goes through? Here is one: (45,45)

Answer 4

(50,50)??

Answer 5

yes

Answer 6

so would this be slope?

Answer 7

the slope is the difference in the y values divided by the difference in the x values

Answer 8

then what we just did is y intercept?

Answer 9

We have not found the y-intercept. we have found two points on the line
(45,45) and (50,50)

these are (x,y) pairs.

find the difference in the y values. example: 50 - 45
now find the difference in x values
then divide i.e. change in y divided by change in x

Answer 10

the difference is 5

Answer 11

what is the difference in y divided by the difference in x?

Answer 12

do you understand that the difference in y is 50-45 = 5
and (by coincidence) the difference in x is 50-45 = 5

Answer 13

not really but if both are 5 and we divide them by each other then that would just give us 1.

Answer 14

yes, we get 1. that is the slope.

to find the slope, write down the 2 points
(45,45) and (50,50)