exam Maths Puzzle Numerical Ability

I just need help setting up the problem, from there I think I can do it.
Thanks.

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what is the soulution for x in this system of equations x+y=6 and 2x-y=9 i got negative five and wasnt sure it was correct Steve wishes to invest $1000 into an account that pays compound interest annually so that the value of his investment will be $5000 after 15 years. What rate of interest will such