1)Solve the linear system of equations by any method.

{-6x+8y=18

{-9x+12y=23

2)Solve the linear system of equations by any method.

{-4x-5y=18

{5x+y=9

3)Solve the linear system of equations by any method.

{x-2y=-6

{6y=18+3x

4)The Nutty Professor sells cashews for $7.30 per pound and Brazil nuts for $4.20 per pound. How much of each type should be used to make a 29 pound mixture that sells for $5.59 per pound?

Round answers to the nearest pound.

__________pounds of cashews

______________pounds of Brazil nuts

5)Gregory just retired, and has $660,000 to invest. A very safe Certificate of Deposit (CD) account pays 1.5%, while a riskier bond fund pays 7.5% in interest. Gregory figures he needs $23,000 a year in interest to live on. How much should he invest in each account to make enough interest while minimizing his risk?

$______at 1.5%

$__________at 7.5%