The following is a list of everything you need to know to be able to complete a question on the line:

Distance:                    

Midpoint:     

Slope:

       1.  Rearrange the equation of the line to suit the formula

       2.  If given the two points use:    

Equation of a line:

      You need the slope and one point on the line

Parallel lines    

m1 = m2

 Perpendicular lines

m1 * m2 = -1

 

Intersection of lines

      Use simultaneous equations and eliminate x or y.  Don't forget to find the second value.

REMEMBER

If the line intersects the x-axis then y=0

If the line intersects the y-axis then x=0

 

Show that a point is on a line:

       Sub the given point into the equation

 

Area of a Triangle:    

       Translate one of the points to (0,0) so that you end  up with the points (0,0) (x1,y1) (x2,y2).   Use the formula below.  

 

      Go back to the top of the page