Matrices Solving Equations

Solve using inverse equations.

• A

• B

• C

• D

Solve the system by inverting the coefficient matrix and using (A^-1)(x)=b. Enter your answer as (x1, x2) format.

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Solve the system by inverting the coefficient matrix and using (A^-1)(x)=b. Type your answer in (x1, x2, x3) format.

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Solve the linear systems together by using the values of b for two separate systems, then reducing an appropriate augmented matrix to reduced row echelon form. Write your answer as (x1, x2), (x1, x2) form.

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Solve the linear systems together by using the values of b for two separate systems, then reducing an appropriate augmented matrix to reduced row echelon form. Write your answer as i(b1, b2), ii(b1, b2), iii(b1, b2), iv(b1, b2) form.

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Is the following matrix elementary?

• yes, it's elementary

• no, it's not elementary

• can't be determined

For the following elementary matrix, describe the elementary row operation.

• The second and first row were switched

• The first row was multiplied by 1/2 and added to the second

• The second row as multiplied by 1/2

• The last row was multiplied by 1/2 and added to the second

Are the following matrices inverses of each other?

• yes

• no

• can't tell

Solve by matrices.

4x+9y=28

-4x-y=-28

• (-7,0)

• (6,0)

• (-6,0)

• (7,0)

Solve by matrices.

7x+y=-9

-3x-y=5

• No solution

• (1,8)

• (-2,-3)

• (-1,-2)