Question

Matrices Help Please

Answer 1

I chose B and I eliminated A and C

Answer 2

So it is B or D

Answer 3

actually you can eliminate C and D right away. since convention is ax + by = c
your linear equation represents:

\[\left[\begin{matrix}-1 & 2 &|&1 \\ 3& -1 & |&2\end{matrix}\right]\]

Answer 4

linear system of equations *

Answer 5

o_o so its b

Answer 6

yes

Answer 7

Would you allow me to finish the rest of these questions with you lol I actually trust your answers

Answer 8

ya np ^_^

Answer 9

:D Yay thank you :3

Answer 10

I chose C and eliminated A and D

Answer 11

i thought it could only be B or C

Answer 12

B and D are the ones to eliminate because of the form of the equation.

A and C make sense.

the solution however is (3, 1) [C]

Answer 13

see idk why i think this, but the ones that have the matching numbers such in this one 4,9 as the answer i eliminate them

Answer 14

as improper as it is, you actually can do that since the only matrix that would satisfy solution (4, 9) is the identity matrix:

\[I = \left[\begin{matrix}1 & 0 \\ 0 & 1\end{matrix}\right]\]

Answer 15

i guess this even allows you to find answer without solving

A and C have right form but i could have eliminated A right away because of its proposed solution

Answer 16

Yes :p these i find the easiest, and the next question is easy. I just want to make sure I chose the next one

Answer 17

I chose the first one

Answer 18

fisrt one is right since convention is always row x column

Answer 19

Yay :D

Answer 20

Warkk! lol

Answer 21

O: YOU KNOW CHOCOBOS

Answer 22

and i chose the 1st one

Answer 23

of course :P

Answer 24

<3 lol you just earned my fanship

Answer 25

I ment the 2nd one

Answer 26

it isn't.

A^2 is not squaring every entry of A but is really the dot product A*A

Answer 27

o

Answer 28

in that case c

Answer 29

D*

Answer 30

yup. D :P

Answer 31

Wark!!!!!!!!!!

Answer 32

Kweh!!

Answer 33

I don't know where to go with this one

Answer 34

actually

Answer 35

i just realized... This system of equations is half of the other equation

Answer 36

yes. and you can deduce the answer from that.

i think It's weird that they mention Cramer's rule. it isn't necessary

Answer 37

well would it be B

Answer 38

no. it would be D.

these 2x2 systems of linear equations represent 2 lines. and there are only 3 possible scenarios for 2 lines to have:


we are dealing with case 3.

D = determinant which is 0 in our case