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

Question

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

anonymous · Answer

|dw:1355603052273:dw|

anonymous · Answer

what is this?

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

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.

anonymous · Answer

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

anonymous · Answer

its alright ty though