How to find y-intercept when given two points?

Question

I have to find the slope and y-intercept with 2 given points. I know how to do the slope but i forgot how to find out the y-intercept.

Ex: (11.3, 4.5) (14.7, 5.3)

The class measured to find the numbers so the numbers may not work or somthing.

Answer 1

http://www.math.com/school/subject2/less...  this is a good site...

....and this one too:http://cs.jsu.edu/mcis/faculty/leathrum/...

Answer 2

y = mx + b

Substitute one of your coordinates for the x and y, and the slope for m, and solve for b, which is the y-intercept.

11.3 = (slope)*4.5 + b