Question

xy+x+y=-13
yz+y+z=-9
xz+x+z=5
Find x,y,z.

Answer 1

x(y+1) + y = -13
so x = (-13 -y)/(y+1)

Answer 2

substitute that in for x, and the rest is just a simple 2 equations with 2 unknown variable problem

Answer 3

please wait.....lemme try...

Answer 4

try.

Answer 5

what is -13-y*z+1?

Answer 6

can you be more clear? post your work

Answer 7

wait i got (-13z-13-yz-y)/y+1 +z=5

Answer 8

ok use equation 2 now:
y(z+1) + z = -9
so y = (-9-z)/(z+1)

plug that in for y

Answer 9

i got z^2+2z=3

Answer 10

ok. that is a quadratic equation. solve it

Answer 11

can z hav 2 values?

Answer 12

yes

Answer 13

then ans is 1,-3

Answer 14

for z

Answer 15

correct

Answer 16

now substitute for z in the other equations

Answer 17

(for simplicity's sake, substitute into the original equations)

Answer 18

ok ,y =-5,3

Answer 19

correct

Answer 20

x=-4,2

Answer 21

there you go. That's it!

Answer 22

thnx....ure awesome!!!!!!!!!!!!!