Line Equations:

 

Slope of the line through points P1(x1, y1) and P2(x2, y2):                       

 

 

Point-slope equation of the line through

point P1(x1, y1) with slope m:                                                                 y – y1 = m(x – x1)

 

 

Slope-intercept equation of the line with

slope m and y-intercept b:                                                                     y = mx + b  

 

 

Two-intercept equation of the line with

x-intercept = a and y-intercept = b: