Saturday

September 20, 2014

September 20, 2014

Posted by **Ryan** on Thursday, February 25, 2010 at 2:10pm.

think I know the answer but I can't show how I got it.

1.) Solve each matrix equation for X.

2X + 5A = B

2.) Find the following matrices: a. AB b. BA

A=

2 4

3 1

4 2

B=

3 2 0

-1 -3 5

3.) Find A-1 by forming A|I and then using row operations to obtain I|B, where A-1 = B, check that

AA-1=I and A-1 A = I

A=

2 4 -4

1 3 -4

2 4 -3

4.) Write the system of linear equations represented by the augmented matrix. Use x,y,z and, if

necessary w,x,y and z for the variables.

7 0 4|-3

0 1 -5|11

2 7 0|6

5.) Use Gaussian elimination to find the complete solution to each system of equations, or show that

none exist.

3w + 2x - y + 2z = -12

4w – x + y + 2z = 1

w + x + y + z = -2

-2w + 3x + 2y – 3z = 10

6.) Use Cramer’s rule to solve the system

X – 3y + z = -2

x + 2y = 8

2x – y = 1

7.) Use Cramer’s rule to solve the system

2x + 2y + 3z =10

4x – y + z = -5

5x -2y + 6z = 1

**Answer this Question**

**Related Questions**

Algebra - Can someone check my algebra answers and help me with the problems I ...

statistics, are my calculations correct? - classify the following as discrete or...

MATH - Adding and Subtracting Rational Expressions there are two problems I get ...

Statistics - Hi, I have to answer if each questions is a nominal, ordinal, ...

Math 7 Help! - 1. negative integer is less than positive integer somtimes, ...

math/integers - how do you solve integers? There are about a thousand different ...

To DrBob222 - I really thank you for helping me with my problems, and not ...

Math - Check My Answers - Please help me with the following(there is 9 problems ...

Business Communications - The interviewer wants to know why you got a "D" in all...

geometry - 1.in which geometry do lines no contain an infinite number of points...