Work. Do Not Solve

work. Do not solve.
-5x + 9y = -12
-4x - 4y = -32
A) Substitution B) Addition
Answer: B
Write the word or phrase that best completes each statement or answers the question.
-A student took out two loans totaling $11,000 to help pay for college expenses. One loan was at 8% simple interest, and the other was at 4%. After one year, the student owed $640 in interest. Find
The amount of the loan at 4%.

A) $400
B) $240
C) $5000
D) $6000