A data set consists of the following data points:

(3,5), (5,8), (6,13)

The slope of the best fit line is 2.5. Find the y-intercept of this line.

Question

A data set consists of the following data points:

(3,5), (5,8), (6,13)

The slope of the best fit line is 2.5. Find the y-intercept of this line.

amistre64 · Answer

the anchor point is going to be the average of the other 3

add em up and divide by 3

amistre64 · Answer

(3,5), 
(5,8), 
(6,13)
------
(14,26)/3

then use the point slope form of a line

y - 26/3 = m(x-14/3)

amistre64 · Answer

a little swapping about and we get:

y = mx+b; where b is the yint nad equate to:

-m*14/3 + 26/3

anonymous · Answer

Ohk. i think i understand!

amistre64 · Answer

its been awhile, but i do believe thats how you find the "common" point to anchor the slope to

its the average of the others

anonymous · Answer

I got -3

amistre64 · Answer

-2.5*14/3 + 26/3 = -3; me too :)