how to export data into different excel sheets of same excel book?

hiii friends... i have a program with a for loop say

for N=0:-1:-25 .

. program . program

.

.

.

.

end for each N value.. results in two equations eq1,eq2 in two variables.(x,y). and after solving i got 4 values (4 roots for x and four roots for y). i have to substitute this variables in other two equations . all combinations (say 4x4=16 combinations). and each combination data should go into each spread sheet of an excel book!! please help me out!!!