2x + y - z = -8 2y + 3z = -6
-1/2x + y + z = -4

For the following matrix, which of the following matrix operations would result in a11 = 1?

A) Multiply row 2 by -1 and add it to row 1

B) Multiply row 3 by -4 and add it to row 1.

C) Multiply row 1 by -1/2

D) Multiply row 1 by 1/2

Aaron invested a total of $4,100, some in an account earning 8% simple interest, and the rest in an account earning 5% simple interest. how much did he invest in each account if after one year he earned $211 in interest? select one: a. $200 at 8%, $3,900 at 5% b. $3,200 at 8%, $900 at 5% c. $900 at 8%, $3,200 at 5% d. $3,900 at 8%, $200 at 5%