Posted by **lilman** on Friday, September 21, 2012 at 11:49am.

the spreadsheet shows the monthly revenue and expenses for a new business.use the models to predictt the month in which revenue will equal expense.

month revenue expenses

jan 4000 22,000

feb 9000 24,000

mar 13,000 25,000

apr 16,000 27,000

may 21,000 30,000

Would someone please help and explain how to figure this out.

This is all I'v come up with and am not sure which one is the right answer or how you get to this point.

r=4100x-300

e=1900x-19900

oct.

4100x=300

1900X+19900

sept.

r=4100x+300

e=1900x+19900

aug.

r=4100x-300

e=1900+19900

sept.

If only someone could explain

- algebra -
**Steve**, Friday, September 21, 2012 at 12:12pm
do a least-squares fit to find the best lines for r and x:

r(m) = 4100m + 300

x(m) = 1900m + 19900

for month #m.

So, r=x when

4100m+300=1900m+19900

m = 98/11, or 9: September

r(9) = 37200

x(9) = 37000

- algebra -
**jj**, Wednesday, April 30, 2014 at 4:07pm
september

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