Question

i need serious help...

Answer 1

Teresa is looking at two accounts in which to invest her money. If she invests $21,000 in the first account and $9,000 in the second account, then her total investment of $30,000 will receive $2490 in interest at the end of one year. If she invests $29,000 in the first account and $1,000 in the second account, then her total investment of $30,000 will receive $2410 in interest at the end of one year.
For each account, what percentage of the investment is received in interest after one year?

Answer 2

Alright we have a system of equations. Let our interest rates be denoted as \(r, s\).
\[21000r+9000s=2490\]
\[29000r+1000s=2410\]
Two equations and two unknowns. Do you know how to solve for \(r\) and \(s\) or do you need help?

Answer 3

12(21000x+9000y)=2490
12(29000x+1000y)=2410