Question

Solve for z. Do not solve for y or x:
x+y+z=15
-2x-y+2z=2
-x -z =13

Answer 1

what is this?

Answer 2

this is how you solve it, make one line of the matrix = 001

Answer 3

is it possible to get D by expansion by minors?
I dont really understand that diagonal method thing too well

Answer 4

ugh i'd rather not, what confuses you about this method?

Answer 5

its ok dont worry I know its long ill have to ask my professor in class, id rather focus on other problems cause I know these can be fustrating for everyone and are like 15 minutes long.

Answer 6

it's not really that long, since you're only solving for z, you can make any line = 001, and forget about the other lines

Answer 7

its alright ty though