slope intercept

i really need help

Ex:  You are given two points...let's say  (1, 3)  and (4, 9)

First....find the slope,  (m)  =  [9 - 3 ] / [ 4 - 1]   =  6/3   = 2

Use the slope and one of the points to write the equation in slope-intercept form....I'll use the first point.....although, the second would work, too..........so we have, in point-slope form :

y - y₁  = m (x - x₁)       where y₁ = 3, m is the slope = 2, and x₁  = 1   so we have

y - 3 = 2(x - 1)   simplify the right side

y - 3 = 2x - 2      add 3 to both sides

y = 2x + 1      

And that's in slope-intercept form, i.e,  y = mx + b   

Hope that helps !!!