Hello. I am looking to make a business related word problem that uses the substitution method. Something that includes variables (preferably 3) that will help me know if a product is profitable. I'm not real familiar with these matrix's but I'd like to see something (example) like 30a + 75b + 80c = 45,000 and then of course solve the problem. Any numbers will work. My goal is to see how to use a business word problem to correlate the substitution method with variables.

Thank you