Question

the party cost ($f) of joining a christmas party is partly constant and partly varies inversely as the number of participants (n). if there are 250 participants, the party fww is $120. for 500 participants, the party fee becomes $110.
1} Express F in terms of n.
2) Find the party fee for 1000 participants.
the two data points provide
250a+b = 120
500a+b = 110

(1) f = an+b
solve the above for a and b, and then find f(1000)

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