Question

Solve the system of linear equations
x-2y+3z = 9
4x+5y+z=7
-x+y-2z=-6
Find z, then y, then x.

Answer 1

http://www.coolmath.com/algebra/12-2x2-systems-of-equations/03-solving-by-elimination-addition-01

Answer 2

hey do u still need help??

Answer 3

x-2y+3z = 9
-x+y-2z=-6 add together
y+z=3

Answer 4

next
4x+5y+z=7
-x+y-2z=-6 multiply the bottom and add
9y-7z=-17

Answer 5

y+z=3 multiply by 7 and add
9y-7z=-17
16y=4
y=1/4

Answer 6

now put 1/4 into one of the two variable equations
(1/4)+z=3
z=2 and 3/4

Answer 7

finally add the two variables to one of the first equations x-2(1/4)+3(11/4) = 9
x-2/4+33/4=9
x=9-31/4
x =1 and 1/4

Answer 8

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Answer 9

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Answer 10

oh no, I solved this already, I went to my professor with it.