college alg help!
posted by alexandra .
cannot figure a way to do this problem:
An investment of $98,000 was made by a business club. The investment was split into three parts and lasted for one year. The first part of the investment earned 8% interest, the second 6%, and third 9%. The total interest from the investments was $7560. The interest from the first investment was 3 times the interest from the second. Find the amounts of the three parts of the investment.
so I let the three investment amounts be E, S, and N
E+S+N=98000
7500=E*.08+S*.06+N*.09
E*.08=3*S*.06
I don't know how to figure out answer past that

Since E = 2.25 S (from the last equation), you can eliminate E from the other two equations. Then solve two equations in two unknows (S and N).
Follow the advice that BobPursley gave to Samantha.