Question

Use an augmented matrix to solve the system of equations. Be sure to identify the row operation being used. 4x+3y=-9, x+4y=-5

Answer 1

@whpalmer4 I need ya!!!

Answer 2

Know what an augmented matrix is?

Answer 3

Nope it's on my study island and we havent learned it yet :/

Answer 4

well palmer I think mccormick has got me covered, but ur more then welcome to stay!

Answer 5

if your equations were:
\(ax + by = c\) and
\(dx + ey = f\) then the augmented form is:

\[\left[ \begin{array}{cc|c}
a & b & c\\
d & e & f
\end{array}\right ]\]

Answer 6

ok well all I know is that u use this for something 10
01

Answer 7

Yes. That is called the reduced, row echelon form. It gives you x and y as:
\(\left[ \begin{array}{cc|c}
1 & 0 & x\\
0 & 1 & y
\end{array}\right ]\)

Answer 8

You use elimination to get there. Add a multiple of one row to the other row.

Answer 9

oh ok

Answer 10

Palmer before he left told me this

If I didn't make any mistakes doing the arithmetic in my head, -21/13,-11/13 ought to be the answer (x,y)

Answer 11

Well, put it into aug marix form and you can see.

Answer 12

i know how but i dont know how to put it in to the format u have

Answer 13

Don't worry about it looking right. Just use spaces

Answer 14

k

Answer 15

-21 / 13,-11 / 13
/ /

i dont know i used substitution in this case because one equation easily solved for a variable

Answer 16

I dont think right when tired well no one does

Answer 17

This part:

4x+3y=-9
x+4y=-5

Just use the numbers and - where needed. Remember that x means 1x.

Answer 18

Thank u for ur help and effort but i have to go to bed etc. i might see u tomorrow?

Answer 19

i have u fanned

Answer 20

I should be around. Night.

Answer 21

Good night to u too!