Question

How do you find out which matrix to multiply when finding a solution? (Attachment below)

Answer 1

Attachment

Answer 2

Hint, multiply both sides by the inverse matrix.

Answer 3

Okay ill try it:) one second

Answer 4

You have to use cramers rule to convert this right?

Answer 5

yes you can use that :)

Answer 6

okay great

Answer 7

How do I go from here?

Answer 8

@perl

Answer 9

Cramers rule is handy, but that's not what they want

Answer 10

Oh okay haha because i tried it and it didn't really work.

Answer 11

Do you agree that this is the original matrix

Answer 12

yes

Answer 13

do i find the inverse of that?

Answer 14

to find the inverse, you'll first need to find the determinant

Answer 15

what is the determinant of that matrix?

Answer 16

oh okay gotcha. one sec:)

Answer 17

2?

Answer 18

yep

Answer 19

let's say D is the determinant, so D = 2

Answer 20

let's keep this value in mind for later

Answer 21

the inverse would be:

4 -3

-5/2 2

Right?

Answer 22

next, you would

step 1) swap the values circled in the drawing

step 2) change the sign of the values in square boxes