Question

Does anyone know how to solve a system of equations with 3 variables?

Answer 1

what is the equation

Answer 2

if you have windows and your on an online school you can use snipping tool to take a pic of it and post it here

Answer 3

ok hold on

Answer 4

x+2y-z=-3
2x-2y+2z=8
2x-y+3z=9

Answer 5

you can use substitution or elimination

Answer 6

if we define x in terms of y and z, we can use that in the other 2 equations ... and it reduces to a system of 2 equations

Answer 7

Ok @amistre64

Answer 8

so now what do I do? @rishavraj

Answer 9

ok see lets use elimination method.....we will eliminate "x"
x + 2y - z = -3 --> say 1st equation
2x - 2y + 2z = 8
which is also x - y + z = 4 ----> say 2nd equation
2x - y + 3z = 9 --> say 3rd equation

Answer 10

Ok, I'm getting it:)

Answer 11

now multiply 2nd equation from -1
and add the new equation with 1st equation.....
"x" gets eliminated......
did u understand??

Answer 12

Yes! :D

Answer 13

Thanks:)

Answer 14

so whts the equation u got??

Answer 15

I got 3x+z=5 and 5x+5z=15 for the 2nd equation

Answer 16

Was I wrong?

Answer 17

hmmmmmmm -_-
wht u did ????
i askd to eliminate "x"
the 1st equation is x + 2y - z = -3
and when u multiply 2nd equation from -1 u get -x + y - z = -4now add these two equations

Answer 18

3y=-7

Answer 19

Oh! I used subsitution!

Answer 20

its 3y - 2z = -7 --->say 4th equation

Answer 21

Ok:)

Answer 22

hey hold on...... wht were the values u got...the answer ??

Answer 23

bco if u meant x = 1
y = -1 and z = 2
then thts correct :)) @SydneyMay17

Answer 24

Yes! I did! <3 Thanks

Answer 25

@rishavraj Sorry, I had to eat dinner

Answer 26

oo cool... not a big deal :))

Answer 27

Can I ask another question, if I open a new link?

Answer 28

for sure

Answer 29

kk!