SuziequeQQ,

Add them:

y=10x+3
+ y=11x-2
__________
2y = 21x+1

Then divide by 2:

2y = 21x+1
__ _____
2 2

And get your answer:

y = 10.5x + .5


The same applies for as many formulas as you have, except you would divide by the count of the
formulas.

HTH,
Bernie
MS Excel MVP


"SuziequeQQ" wrote in message
...
I have about 10 to average and I have no idea how to do it. Thanks!!