1.Write an augmented matrix for the following system of equations.

-3x+9=7

5x-6y=1

2. Write an augmented matrix for the following system of equations.

7x-2y+7z=-4

8x-4y+z=-2

y-z=-2

3. Write the system of equations associated with the following augmented matrix.(Type equations using x and y as the variables.)

1 0 | 5

0 1 | 6

4.Use the Gauss-Jordan method to solve the following system of equations.

x+y=8

5xx+4y=35

5.Use the Gauss-Jordan method to solve the following system of equations.

6x-5y=7

12x-10y=1

6.Use the Gauss-Jordan method to solve the following system of equations.

4x-5y=7

16x-20y=28

7.Use the Gauss-Jordan method to solve the each system of equations.

4x+4y-4z=4

2x-y+z=5

x-4y+3z=-8

8.Use the Gauss-Jordan method to solve the each system of equations.

3x+8y-z=0

5x-y+3z=1

8x+7y+2z=1

9.Use the Gauss-Jordan method to solve the each system of equations.

7x-3y+3z=5

7x+2y-z=12

35x-10y+11z=32

10.If 30 lb of rice and 20 lb of potatoes cost $18.20, and 20 lb of rice and 12 lb of potatoes cost $11.52, how much will 10 lb of rice and 50 lb of potatoes cost?Let x be the cost of 1 lb of rice and y be the cost of 1 lb of potatoes. Set up two linear equations from the given information using x and y as the variables.

11.A person has $34,000 invested in stock A and stock B. Stock A currently sells for $20 a share and stock B sells for $70 a share. If stock B triples in value and stock A goes up 50%, his stock will be worth $93,000. How many shares of each stock does he own? The person owns ? shares of stock A snd ? shares of stock B?