Question

use the interactive matrix tool to solve the system of equations.

3x+4y=18
-2x+5y=34

Answer 1

do they mean on your calculator? or some sort of applet?

Answer 2

im not sure...it just says that on my homework?

Answer 3

i think its something like this..... http://answers.yahoo.com/question/index?qid=20100519152741AAliq6f

Answer 4

you know anything about matrices? (plural of matrix)

Answer 5

NOPE! lol

Answer 6

well, i don't know that I can properly teach that concept in this medium. this some online course?

Answer 7

you got a TI-83 or any higher graphing calculator?

Answer 8

i could walk you step by step with one of those.

Answer 9

yes its an online course

Answer 10

no i dont :x

Answer 11

if you have to know them, study here
http://tutorial.math.lamar.edu/Classes/LinAlg/SystemEqns_Matrices.aspx

here are some other sites to help you
http://www.coolmath.com/algebra/index.html
http://khanacademy.org
http://patrickjmt.com
good luck in your quest and seriously check these sites.

Answer 12

i'll solve this one matrix styley!
\[\left[\begin{matrix}3 & 4 \\ -2 & 5\end{matrix}\right]\left[\begin{matrix}x \\ y\end{matrix}\right]=\left[\begin{matrix}18 \\ 34\end{matrix}\right]\]
Let A be the 2x2 matrix and let C be the 2x1 matrix it is equal to.
By matrices we can find what x and y equal to make this true.
\[AX=C\]
\[A^{-1}AX=A^{-1}C\]
\[X=A^{-1}C\]
which will be a 2x1 matrix.
if
\[\left[\begin{matrix}a & b \\ c & d\end{matrix}\right]\]
is your matrix, then
\[A^{-1}=\frac{1}{det(A)}\left[\begin{matrix}d & -b \\ -c & a\end{matrix}\right]\]
Where
\[det(A)=ad-bc\]
so,
\[A^{-1}=\frac{1}{23}\left[\begin{matrix}5 & -4 \\ 2 & 3\end{matrix}\right]\]
\[A^{-1}=\left[\begin{matrix}\frac{5}{23} & \frac{-4}{23} \\ \frac{2}{23} & \frac{3}{23} \end{matrix}\right]\]
Now let's find out what
\[A^{-1}C\]
is equal to.
\[\left[\begin{matrix}\frac{5}{23} & \frac{-4}{23} \\ \frac{2}{23} & \frac{3}{23} \end{matrix}\right]\left[\begin{matrix}18 \\ 34\end{matrix}\right]\]
\[\left[\begin{matrix}-2 \\ 6\end{matrix}\right]\]
therefore, x=-2, y=6.
your ordered pair is (-2,6)

Answer 13

fun.

Answer 14

CONFUSING