Math Home Work, Solve using substitution.?

Question

I will return the favor and answer your questions, if asked.! Easy best answer to whoever answers all of them, correctly.!!!

12) 3x+2y-z=8

-3x+4y+5z=-14

x-3y+4z=-14

15) 5x-4y+4z=18

-x+3y-2z=0

4x-2y+7z=3

22) x+y-2z=-8

-x+2y+z=8

2x+3y-z=1

23) 2x-3y+z=10

y+2z=13

z=5

24) 2x-2y+z =3

5y-z =-31

x+3y+2z=-21

please do them all and not just one, but if you only know just one just do it. Remember best answer, +10 points for whoever does them all, or most of them!!! Thank you and God Bless

Answer 1

I am assuming you know how to solve for these, and I will not write down step by step the solutions because that would just take too long. Hope this helps.

12) x = 1 y = 1 z = -3

15) x = 6 y = 0 z = -3

22) x = 0.5 y = 1.7 z = 5.1

23) x = 7 y = 3 z = 5

24) x= -5 y = -6 z = 1