How much did she invest in each account?

Question

Last year, Linda had $10,000 to invest. She invested some of it in an account that paid 8% simple interest per year, and she invested the rest in an account that paid 5% simple interest per year. After one year, she received a total of $770 in interest. How much did she invest in each account? 

Answer 1

x + y = 10000

.08x + .05y = 770

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solve the system.