MIdpoint
To be able to do this you need to know the basics of graphing, fractions and averaging.
Step one
you can find the number exactly between them by averaging them, by adding them together and dividing by two. You will be adding the ys from the points you'd like to find the midpoint of and adding the xs from the points you'd like to find the midpoint of. The formula will look something like this: ( y1+y2 x1+x2)
( /2 /2 )
or ( y1+y2/2 & x1+x2/2)
( /2 /2 )
or ( y1+y2/2 & x1+x2/2)
Step 2
Next you add t
formula will look something like this: ( y1+y2 x1+x2) = (sum of ys sums of xs)( /2 /2 ) ( /2 /2 )
or ( y1+y2/2 & x1+x2/2) = (sum of ys/2 & sums of xs/2)
Step 3
Take the equation you got and
Now you're done :)
Still need help? Here's a websites that can help you: http://www.purplemath.com/modules/midpoint.htm or http://mathworld.wolfram.com/Midpoint.html.