6.
Ana Maria had $28,000 to invest. She divided the money into three
different accounts. At the end of the year, she earned $1.160 in interest.
The annual yield on each of the three accounts was 3.5%. 4.25% and
4.75%. The amount of money in the 4.75% account was 75% of the
amount of money in the 3.5% account. Define the variables and write a
system of equations to represent the situation.

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Respuesta :

mathstudent55 mathstudent55 · Answer 1 · 2020-09-24T16:34:50+02:00

Answer:

x + y + z = 28,000

0.035x + 0.0425y + 0.0475z = 1160

z = 0.75x

Step-by-step explanation:

Let x = amount invested at 3.5%.

Let y = amount invested at 4.25%.

Let z = amount invested at 4.75%.

The total amount is $28,000.

Equation 1:

x + y + z = 28,000

The total interest is $1,160.

Equation 2:

0.035x + 0.0425y + 0.0475z = 1160

"The amount of money in the 4.75% account was 75% of the

amount of money in the 3.5% account."

Equation 3:

z = 0.75x

The system of equations is:

x + y + z = 28,000

0.035x + 0.0425y + 0.0475z = 1160

z = 0.75x